diff --git a/src/app/Http/Controllers/API/V4/OpenViduController.php b/src/app/Http/Controllers/API/V4/OpenViduController.php
--- a/src/app/Http/Controllers/API/V4/OpenViduController.php
+++ b/src/app/Http/Controllers/API/V4/OpenViduController.php
@@ -12,7 +12,7 @@
 class OpenViduController extends Controller
 {
     /**
-     * Accepting the room join request.
+     * Accept the room join request.
      *
      * @param string $id    Room identifier (name)
      * @param string $reqid Request identifier
@@ -28,10 +28,8 @@
             return $this->errorResponse(404, \trans('meet.room-not-found'));
         }
 
-        $user = Auth::guard()->user();
-
-        // Only the room owner can do it
-        if (!$user || $user->id != $room->user_id) {
+        // Only the moderator can do it
+        if (!$this->isModerator($room)) {
             return $this->errorResponse(403);
         }
 
@@ -43,7 +41,7 @@
     }
 
     /**
-     * Denying the room join request.
+     * Deny the room join request.
      *
      * @param string $id    Room identifier (name)
      * @param string $reqid Request identifier
@@ -59,10 +57,8 @@
             return $this->errorResponse(404, \trans('meet.room-not-found'));
         }
 
-        $user = Auth::guard()->user();
-
-        // Only the room owner can do it
-        if (!$user || $user->id != $room->user_id) {
+        // Only the moderator can do it
+        if (!$this->isModerator($room)) {
             return $this->errorResponse(403);
         }
 
@@ -107,7 +103,7 @@
     }
 
     /**
-     * Accepting the room join request.
+     * Dismiss the participant/connection from the session.
      *
      * @param string $id   Room identifier (name)
      * @param string $conn Connection identifier
@@ -123,10 +119,8 @@
             return $this->errorResponse(404, \trans('meet.connection-not-found'));
         }
 
-        $user = Auth::guard()->user();
-
-        // Only the room owner can do it (for now)
-        if (!$user || $user->id != $connection->room->user_id) {
+        // Only the moderator can do it
+        if (!$this->isModerator($connection->room)) {
             return $this->errorResponse(403);
         }
 
@@ -372,6 +366,42 @@
         ]);
     }
 
+    /**
+     * Update the participant/connection parameters (e.g. role).
+     *
+     * @param string $id   Room identifier (name)
+     * @param string $conn Connection identifier
+     *
+     * @return \Illuminate\Http\JsonResponse
+     */
+    public function updateConnection($id, $conn)
+    {
+        $connection = Connection::where('id', $conn)->first();
+
+        // There's no such connection, bye bye
+        if (!$connection || $connection->room->name != $id) {
+            return $this->errorResponse(404, \trans('meet.connection-not-found'));
+        }
+
+        // Only the moderator can do it
+        if (!$this->isModerator($connection->room)) {
+            return $this->errorResponse(403);
+        }
+
+        foreach (request()->input() as $key => $value) {
+            switch ($key) {
+                case 'role':
+                    $connection->{$key} = $value;
+                    break;
+            }
+        }
+
+        // The connection observer will send a signal to everyone when needed
+        $connection->save();
+
+        return response()->json(['status' => 'success']);
+    }
+
     /**
      * Webhook as triggered from OpenVidu server
      *
@@ -406,4 +436,25 @@
 
         return response('Success', 200);
     }
+
+    /**
+     * Check if current user is a moderator for the specified room.
+     *
+     * @param \App\OpenVidu\Room $room The room
+     *
+     * @return bool True if the current user is the room moderator
+     */
+    protected function isModerator(Room $room): bool
+    {
+        $user = Auth::guard()->user();
+
+        // The room owner is a moderator
+        if ($user && $user->id == $room->user_id) {
+            return true;
+        }
+
+        // TODO: Moderators authentication
+
+        return false;
+    }
 }
diff --git a/src/app/Observers/OpenVidu/ConnectionObserver.php b/src/app/Observers/OpenVidu/ConnectionObserver.php
new file mode 100644
--- /dev/null
+++ b/src/app/Observers/OpenVidu/ConnectionObserver.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Observers\OpenVidu;
+
+use App\OpenVidu\Connection;
+
+class ConnectionObserver
+{
+    /**
+     * Handle the OpenVidu connection "updated" event.
+     *
+     * @param \App\OpenVidu\Connection $connection The connection.
+     *
+     * @return void
+     */
+    public function updated(Connection $connection)
+    {
+        if ($connection->role != $connection->getOriginal('role')) {
+            $params = [
+                'connectionId' => $connection->id,
+                'role' => $connection->role
+            ];
+
+            // Send the signal to all participants
+            $connection->room->signal('connectionUpdate', $params);
+
+            // TODO: When demoting publisher to subscriber maybe we should
+            // destroy all streams using REST API. For now we trust the
+            // participant browser to do this.
+        }
+    }
+}
diff --git a/src/app/OpenVidu/Connection.php b/src/app/OpenVidu/Connection.php
--- a/src/app/OpenVidu/Connection.php
+++ b/src/app/OpenVidu/Connection.php
@@ -54,4 +54,45 @@
     {
         return $this->belongsTo(Room::class, 'room_id', 'id');
     }
+
+    /**
+     * Connection role mutator
+     *
+     * @throws \Exception
+     */
+    public function setRoleAttribute($role)
+    {
+        $new_role = 0;
+
+        $allowed_values = [
+            Room::ROLE_SUBSCRIBER,
+            Room::ROLE_PUBLISHER,
+            Room::ROLE_MODERATOR,
+            Room::ROLE_SCREEN,
+            Room::ROLE_OWNER,
+        ];
+
+        foreach ($allowed_values as $value) {
+            if ($role & $value) {
+                $new_role |= $value;
+                $role ^= $value;
+            }
+        }
+
+        if ($role > 0) {
+            throw new \Exception("Invalid connection role: {$role}");
+        }
+
+        // It is either screen sharing connection or publisher/subscriber connection
+        if ($new_role & Room::ROLE_SCREEN) {
+            if ($new_role & Room::ROLE_PUBLISHER) {
+                $new_role ^= Room::ROLE_PUBLISHER;
+            }
+            if ($new_role & Room::ROLE_SUBSCRIBER) {
+                $new_role ^= Room::ROLE_SUBSCRIBER;
+            }
+        }
+
+        $this->attributes['role'] = $new_role;
+    }
 }
diff --git a/src/app/Providers/AppServiceProvider.php b/src/app/Providers/AppServiceProvider.php
--- a/src/app/Providers/AppServiceProvider.php
+++ b/src/app/Providers/AppServiceProvider.php
@@ -30,6 +30,7 @@
         \App\Domain::observe(\App\Observers\DomainObserver::class);
         \App\Entitlement::observe(\App\Observers\EntitlementObserver::class);
         \App\Group::observe(\App\Observers\GroupObserver::class);
+        \App\OpenVidu\Connection::observe(\App\Observers\OpenVidu\ConnectionObserver::class);
         \App\Package::observe(\App\Observers\PackageObserver::class);
         \App\PackageSku::observe(\App\Observers\PackageSkuObserver::class);
         \App\Plan::observe(\App\Observers\PlanObserver::class);
diff --git a/src/resources/js/meet/app.js b/src/resources/js/meet/app.js
--- a/src/resources/js/meet/app.js
+++ b/src/resources/js/meet/app.js
@@ -17,7 +17,6 @@
     let publisher               // Publisher object which the user will publish
     let audioActive = false     // True if the audio track of the publisher is active
     let videoActive = false     // True if the video track of the publisher is active
-    let numOfVideos = 0         // Keeps track of the number of videos that are being shown
     let audioSource = ''        // Currently selected microphone
     let videoSource = ''        // Currently selected camera
     let sessionData             // Room session metadata
@@ -76,8 +75,9 @@
     /**
      * Join the room session
      *
-     * @param data Session metadata and event handlers (session, token, shareToken, nickname, role,
-     *             chatElement, menuElement, onDestroy, onJoinRequest)
+     * @param data Session metadata and event handlers (token, shareToken, nickname, role,
+     *             chatElement, menuElement, onDestroy, onJoinRequest, onDismiss, onConnectionChange,
+     *             onSessionDataUpdate)
      */
     function joinRoom(data) {
         resize();
@@ -108,18 +108,12 @@
             // This is the first event executed when a user joins in.
             // We'll create the video wrapper here, which can be re-used
             // in 'streamCreated' event handler.
-            // Note: For a user with a subscriber role 'streamCreated' event
-            // is not being dispatched at all
 
             let metadata = connectionData(event.connection)
-            let connectionId = event.connection.connectionId
-            metadata.connId = connectionId
 
-            let element = participantCreate(metadata)
+            metadata.element = participantCreate(metadata)
 
-            connections[connectionId] = { element }
-
-            resize()
+            connections[metadata.connectionId] = metadata
 
             // Send the current user status to the connecting user
             // otherwise e.g. nickname might be not up to date
@@ -129,9 +123,6 @@
         session.on('connectionDestroyed', event => {
             let conn = connections[event.connection.connectionId]
             if (conn) {
-                if ($(conn.element).is('.meet-video')) {
-                    numOfVideos--
-                }
                 $(conn.element).remove()
                 delete connections[event.connection.connectionId]
             }
@@ -140,17 +131,15 @@
 
         // On every new Stream received...
         session.on('streamCreated', event => {
-            let connection = event.stream.connection
-            let connectionId = connection.connectionId
-            let metadata = connectionData(connection)
-            let wrapper = connections[connectionId].element
+            let connectionId = event.stream.connection.connectionId
+            let metadata = connections[connectionId]
             let props = {
                 // Prepend the video element so it is always before the watermark element
                 insertMode: 'PREPEND'
             }
 
             // Subscribe to the Stream to receive it
-            let subscriber = session.subscribe(event.stream, wrapper, props);
+            let subscriber = session.subscribe(event.stream, metadata.element, props);
 
             subscriber.on('videoElementCreated', event => {
                 $(event.element).prop({
@@ -159,17 +148,29 @@
 
                 resize()
             })
-/*
-            subscriber.on('videoElementDestroyed', event => {
-            })
-*/
+
+            metadata.audioActive = event.stream.audioActive
+            metadata.videoActive = event.stream.videoActive
+
             // Update the wrapper controls/status
-            participantUpdate(wrapper, event.stream)
+            participantUpdate(metadata.element, metadata)
         })
-/*
-        session.on('streamDestroyed', event => {
+
+        // Stream properties changes e.g. audio/video muted/unmuted
+        session.on('streamPropertyChanged', event => {
+            let connectionId = event.stream.connection.connectionId
+            let metadata = connections[connectionId]
+
+            if (session.connection.connectionId == connectionId) {
+                metadata = sessionData
+            }
+
+            if (metadata) {
+                metadata[event.changedProperty] = event.newValue
+                participantUpdate(metadata.element, metadata)
+            }
         })
-*/
+
         // Handle session disconnection events
         session.on('sessionDisconnected', event => {
             if (data.onDestroy) {
@@ -185,8 +186,13 @@
         // Connect with the token
         session.connect(data.token, data.params)
             .then(() => {
-                let wrapper
-                let params = { self: true, role: data.role, audioActive, videoActive }
+                let params = {
+                    connectionId: session.connection.connectionId,
+                    role: data.role,
+                    audioActive,
+                    videoActive
+                }
+
                 params = Object.assign({}, data.params, params)
 
                 publisher.on('videoElementCreated', event => {
@@ -198,15 +204,14 @@
                     resize()
                 })
 
-                wrapper = participantCreate(params)
+                let wrapper = participantCreate(params)
 
                 if (data.role & Roles.PUBLISHER) {
                     publisher.createVideoElement(wrapper, 'PREPEND')
                     session.publish(publisher)
                 }
 
-                resize()
-                sessionData.wrapper = wrapper
+                sessionData.element = wrapper
             })
             .catch(error => {
                 console.error('There was an error connecting to the session: ', error.message);
@@ -433,10 +438,12 @@
 
         switch (signal.type) {
             case 'signal:userChanged':
+                // TODO: Use 'signal:connectionUpdate' for nickname updates?
                 if (conn = connections[connId]) {
                     data = JSON.parse(signal.data)
 
-                    participantUpdate(conn.element, data)
+                    conn.nickname = data.nickname
+                    participantUpdate(conn.element, conn)
                     nicknameUpdate(data.nickname, connId)
                 }
                 break
@@ -448,10 +455,20 @@
                 break
 
             case 'signal:joinRequest':
-                if (sessionData.onJoinRequest) {
+                // accept requests from the server only
+                if (!connId && sessionData.onJoinRequest) {
                     sessionData.onJoinRequest(JSON.parse(signal.data))
                 }
-                break;
+                break
+
+            case 'signal:connectionUpdate':
+                // accept requests from the server only
+                if (!connId) {
+                    data = JSON.parse(signal.data)
+
+                    connectionUpdate(data)
+                }
+                break
         }
     }
 
@@ -542,14 +559,9 @@
      */
     function signalUserUpdate(connection) {
         let data = {
-            audioActive,
-            videoActive,
             nickname: sessionData.params.nickname
         }
 
-        // Note: StreamPropertyChangedEvent might be more standard way
-        // to propagate the audio/video state change to other users.
-        // It looks there's no other way to propagate nickname changes.
         session.signal({
             data: JSON.stringify(data),
             type: 'userChanged',
@@ -558,8 +570,6 @@
 
         // The same nickname for screen sharing session
         if (screenSession) {
-            data.audioActive = false
-            data.videoActive = true
             screenSession.signal({
                 data: JSON.stringify(data),
                 type: 'userChanged',
@@ -580,8 +590,6 @@
             try {
                 publisher.publishAudio(!audioActive)
                 audioActive = !audioActive
-                participantUpdate(sessionData.wrapper, { audioActive })
-                signalUserUpdate()
             } catch (e) {
                 console.error(e)
             }
@@ -602,8 +610,6 @@
             try {
                 publisher.publishVideo(!videoActive)
                 videoActive = !videoActive
-                participantUpdate(sessionData.wrapper, { videoActive })
-                signalUserUpdate()
             } catch (e) {
                 console.error(e)
             }
@@ -640,6 +646,65 @@
         return !!OV.checkScreenSharingCapabilities();
     }
 
+    /**
+     * Update participant connection state
+     */
+    function connectionUpdate(data) {
+        let conn = connections[data.connectionId]
+
+        // It's me
+        if (session.connection.connectionId == data.connectionId) {
+            const rolePublisher = data.role && data.role & Roles.PUBLISHER
+            const isPublisher = sessionData.role & Roles.PUBLISHER
+
+            // Inform the vue component, so it can update some UI controls
+            let update = () => {
+                if (sessionData.onSessionDataUpdate) {
+                    sessionData.onSessionDataUpdate(data)
+                }
+            }
+
+            // demoted to a subscriber
+            if ('role' in data && isPublisher && !rolePublisher) {
+                session.unpublish(publisher)
+                // FIXME: There's a reference in OpenVidu to a video element that should not
+                // exist anymore. It causes issues when we try to do publish/unpublish
+                // sequence multiple times in a row. So, we're clearing the reference here.
+                let videos = publisher.stream.streamManager.videos
+                publisher.stream.streamManager.videos = videos.filter(video => video.video.parentNode != null)
+            }
+
+            // merge the changed data into internal session metadata object
+            Object.keys(data).forEach(key => { sessionData[key] = data[key] })
+
+            // update the participant element
+            sessionData.element = participantUpdate(sessionData.element, sessionData)
+
+            // promoted to a publisher
+            if ('role' in data && !isPublisher && rolePublisher) {
+                publisher.createVideoElement(sessionData.element, 'PREPEND')
+                session.publish(publisher).then(() => {
+                    data.audioActive = publisher.stream.audioActive
+                    data.videoActive = publisher.stream.videoActive
+                    update()
+                })
+
+                // TODO: Here the user is asked for media permissions again
+                // should we rather start the stream without asking the user?
+                // Or maybe we want to display the media setup/preview form?
+                // Need to find a way to do this.
+            } else {
+                // Inform the vue component, so it can update some UI controls
+                update()
+            }
+        } else if (conn) {
+            // merge the changed data into internal session metadata object
+            Object.keys(data).forEach(key => { conn[key] = data[key] })
+
+            conn.element = participantUpdate(conn.element, conn)
+        }
+    }
+
     /**
      * Update nickname in chat
      *
@@ -667,11 +732,19 @@
      * @return The element
      */
     function participantCreate(params) {
+        let element
+
+        params.isSelf = params.isSelf || session.connection.connectionId == params.connectionId
+
         if (params.role & Roles.PUBLISHER || params.role & Roles.SCREEN) {
-            return publisherCreate(params)
+            element = publisherCreate(params)
+        } else {
+            element = subscriberCreate(params)
         }
 
-        return subscriberCreate(params)
+        setTimeout(resize, 50);
+
+        return element
     }
 
     /**
@@ -699,7 +772,7 @@
         // Append the nickname widget
         wrapper.find('.controls').before(nicknameWidget(params))
 
-        if (!params.self) {
+        if (!params.isSelf) {
             // Enable audio mute button
             wrapper.find('.link-audio').removeClass('hidden')
                 .on('click', e => {
@@ -731,12 +804,12 @@
             })
         }
 
-        numOfVideos++
-
         // Remove the subscriber element, if exists
-        $('#subscriber-' + params.connId).remove()
+        $('#subscriber-' + params.connectionId).remove()
 
-        return wrapper[params.self ? 'prependTo' : 'appendTo'](container).get(0)
+        return wrapper[params.isSelf ? 'prependTo' : 'appendTo'](container)
+            .attr('id', 'publisher-' + params.connectionId)
+            .get(0)
     }
 
     /**
@@ -746,27 +819,51 @@
      * @param params  Connection metadata/params
      */
     function participantUpdate(wrapper, params) {
-        const $element = $(wrapper)
+        const element = $(wrapper)
+        const isModerator = sessionData.role & Roles.MODERATOR
+        const isSelf = session.connection.connectionId == params.connectionId
+
+        // Handle publisher-to-subscriber and subscriber-to-publisher change
+        if ('role' in params && !(params.role & Roles.SCREEN)) {
+            const rolePublisher = params.role & Roles.PUBLISHER
+            const isPublisher = element.is('.meet-video')
+
+            if ((rolePublisher && !isPublisher) || (!rolePublisher && isPublisher)) {
+                element.remove()
+                return participantCreate(params)
+            }
+
+            element.find('.action-role-publisher input').prop('checked', params.role & Roles.PUBLISHER)
+        }
 
         if ('audioActive' in params) {
-            $element.find('.status-audio')[params.audioActive ? 'addClass' : 'removeClass']('hidden')
+            element.find('.status-audio')[params.audioActive ? 'addClass' : 'removeClass']('hidden')
         }
 
         if ('videoActive' in params) {
-            $element.find('.status-video')[params.videoActive ? 'addClass' : 'removeClass']('hidden')
+            element.find('.status-video')[params.videoActive ? 'addClass' : 'removeClass']('hidden')
         }
 
         if ('nickname' in params) {
-            $element.find('.meet-nickname > .content').text(params.nickname)
+            element.find('.meet-nickname > .content').text(params.nickname)
+        }
+
+        if (isSelf) {
+            element.addClass('self')
         }
 
-        if (params.self) {
-            $element.addClass('self')
+        if (isModerator) {
+            element.addClass('moderated')
         }
 
-        if (sessionData.role & Roles.MODERATOR) {
-            $element.addClass('moderated')
+        element.find('.dropdown-menu')[isSelf || isModerator ? 'removeClass' : 'addClass']('hidden')
+        element.find('.permissions')[isModerator ? 'removeClass' : 'addClass']('hidden')
+
+        if ('role' in params && params.role & Roles.SCREEN) {
+            element.find('.permissions').addClass('hidden')
         }
+
+        return wrapper
     }
 
     /**
@@ -780,8 +877,8 @@
 
         participantUpdate(wrapper, params)
 
-        return wrapper[params.self ? 'prependTo' : 'appendTo'](subscribersContainer)
-            .attr('id', 'subscriber-' + params.connId)
+        return wrapper[params.isSelf ? 'prependTo' : 'appendTo'](subscribersContainer)
+            .attr('id', 'subscriber-' + params.connectionId)
             .get(0)
     }
 
@@ -794,20 +891,35 @@
         // Create the element
         let element = $(
             '<div class="dropdown">'
-                + '<a href="#" class="meet-nickname btn" title="Nickname" aria-haspopup="true" aria-expanded="false" role="button">'
+                + '<a href="#" class="meet-nickname btn" aria-haspopup="true" aria-expanded="false" role="button">'
                     + '<span class="content"></span>'
                     + '<span class="icon">' + svgIcon('user') + '</span>'
                 + '</a>'
                 + '<div class="dropdown-menu">'
+                    + '<a class="dropdown-item action-nickname" href="#">Nickname</a>'
                     + '<a class="dropdown-item action-dismiss" href="#">Dismiss</a>'
+                    + '<div class="dropdown-divider permissions"></div>'
+                    + '<div class="permissions">'
+                        + '<h6 class="dropdown-header">Permissions</h6>'
+                        + '<label class="dropdown-item action-role-publisher custom-control custom-switch">'
+                            + '<input type="checkbox" class="custom-control-input">'
+                            + ' <span class="custom-control-label">Audio &amp; Video publishing</span>'
+                        + '</label>'
+                        //+ '<label class="dropdown-item action-role-moderator custom-control custom-switch">'
+                        //    + '<input type="checkbox" class="custom-control-input">'
+                        //    + ' <span class="custom-control-label">Moderation</span>'
+                        //+ '</label>'
+                    + '</div>'
                 + '</div>'
             + '</div>'
         )
 
         let nickname = element.find('.meet-nickname')
-            .addClass('btn btn-outline-' + (params.self ? 'primary' : 'secondary'))
+            .addClass('btn btn-outline-' + (params.isSelf ? 'primary' : 'secondary'))
+            .attr({title: 'Options', 'data-toggle': 'dropdown'})
+            .dropdown({boundary: container})
 
-        if (params.self) {
+        if (params.isSelf) {
             // Add events for nickname change
             let editable = element.find('.content')[0]
             let editableEnable = () => {
@@ -821,7 +933,8 @@
                 nicknameUpdate(editable.innerText, session.connection.connectionId)
             }
 
-            nickname.on('click', editableEnable)
+            element.find('.action-nickname').on('click', editableEnable)
+            element.find('.action-dismiss').remove()
 
             $(editable).on('blur', editableUpdate)
                 .on('keydown', e => {
@@ -831,17 +944,50 @@
                         return false
                     }
                 })
-        } else if (sessionData.role & Roles.MODERATOR) {
-            nickname.attr({title: 'Options', 'data-toggle': 'dropdown'})
-                .dropdown({boundary: container})
+        } else {
+            element.find('.action-nickname').remove()
 
             element.find('.action-dismiss').on('click', e => {
                 if (sessionData.onDismiss) {
-                    sessionData.onDismiss(params.connId)
+                    sessionData.onDismiss(params.connectionId)
                 }
             })
         }
 
+        // Don't close the menu on permission change
+        element.find('.dropdown-menu > label').on('click', e => { e.stopPropagation() })
+
+        if (sessionData.onConnectionChange) {
+            element.find('.action-role-publisher input').on('change', e => {
+                const enabled = e.target.checked
+                let role = params.role
+
+                if (enabled) {
+                    role |= Roles.PUBLISHER
+                } else {
+                    role |= Roles.SUBSCRIBER
+                    if (role & Roles.PUBLISHER) {
+                        role ^= Roles.PUBLISHER
+                    }
+                }
+
+                sessionData.onConnectionChange(params.connectionId, { role })
+            })
+
+            element.find('.action-role-moderator input').on('change', e => {
+                const enabled = e.target.checked
+                let role = params.role
+
+                if (enabled) {
+                    role |= Roles.MODERATOR
+                } else if (role & Roles.MODERATOR) {
+                    role ^= Roles.MODERATOR
+                }
+
+                sessionData.onConnectionChange(params.connectionId, { role })
+            })
+        }
+
         return element.get(0)
     }
 
@@ -864,6 +1010,7 @@
      * Update the room "matrix" layout
      */
     function updateLayout() {
+        let numOfVideos = $(container).find('.meet-video').length
         if (!numOfVideos) {
             return
         }
@@ -1071,7 +1218,11 @@
         // OpenVidu is unable to merge these two objects into one, for it it is only
         // two strings, so it puts a "%/%" separator in between, we'll replace it with comma
         // to get one parseable json object
-        return JSON.parse(connection.data.replace('}%/%{', ','))
+        let data = JSON.parse(connection.data.replace('}%/%{', ','))
+
+        data.connectionId = connection.connectionId
+
+        return data
     }
 }
 
diff --git a/src/resources/themes/meet.scss b/src/resources/themes/meet.scss
--- a/src/resources/themes/meet.scss
+++ b/src/resources/themes/meet.scss
@@ -35,6 +35,13 @@
             }
         }
     }
+
+    & + .dropdown-menu {
+        .permissions > label {
+            margin: 0;
+            padding-left: 3.75rem;
+        }
+    }
 }
 
 .meet-video {
diff --git a/src/resources/vue/Meet/Room.vue b/src/resources/vue/Meet/Room.vue
--- a/src/resources/vue/Meet/Room.vue
+++ b/src/resources/vue/Meet/Room.vue
@@ -316,6 +316,9 @@
                     $('#meet-session-menu').find('.link-fullscreen.closed').removeClass('hidden')
                 }
             },
+            isModerator() {
+                return this.isRoomOwner() || (!!this.session.role && (this.session.role & Roles.MODERATOR) > 0)
+            },
             isPublisher() {
                 return !!this.session.role && (this.session.role & Roles.PUBLISHER) > 0
             },
@@ -414,12 +417,10 @@
                         }).modal()
                     }
                 }
-
                 this.session.onDismiss = connId => { this.dismissParticipant(connId) }
-
-                if (this.isRoomOwner()) {
-                    this.session.onJoinRequest = data => { this.joinRequest(data) }
-                }
+                this.session.onSessionDataUpdate = data => { this.updateSession(data) }
+                this.session.onConnectionChange = (connId, data) => { this.updateParticipant(connId, data) }
+                this.session.onJoinRequest = data => { this.joinRequest(data) }
 
                 this.meet.joinRoom(this.session)
             },
@@ -570,14 +571,43 @@
                     if (!enabled) {
                         // TODO: This might need to be a different route. E.g. the room password might have
                         //       changed since user joined the session
+                        //       Also because it creates a redundant connection (token)
                         axios.post('/api/v4/openvidu/rooms/' + this.room, this.post, { ignoreErrors: true })
                             .then(response => {
                                 // Response data contains: session, token and shareToken
-                                this.session.shareToken = response.data.token
+                                this.session.shareToken = response.data.shareToken
                                 this.meet.updateSession(this.session)
                             })
                     }
                 })
+            },
+            updateParticipant(connId, params) {
+                if (this.isModerator()) {
+                    axios.put('/api/v4/openvidu/rooms/' + this.room + '/connections/' + connId, params)
+                }
+            },
+            updateSession(data) {
+                let params = {}
+
+                if ('role' in data) {
+                    params.role = data.role
+                }
+
+                // merge new params into the object
+                this.session = Object.assign({}, this.session, params)
+
+                // update some buttons state e.g. when switching from publisher to subscriber
+                if (!this.isPublisher()) {
+                    this.setMenuItem('audio', false)
+                    this.setMenuItem('video', false)
+                } else {
+                    if ('videoActive' in data) {
+                        this.setMenuItem('video', data.videoActive)
+                    }
+                    if ('audioActive' in data) {
+                        this.setMenuItem('audio', data.audioActive)
+                    }
+                }
             }
         }
     }
diff --git a/src/routes/api.php b/src/routes/api.php
--- a/src/routes/api.php
+++ b/src/routes/api.php
@@ -86,6 +86,7 @@
         Route::post('openvidu/rooms/{id}/config', 'API\V4\OpenViduController@setRoomConfig');
         // FIXME: I'm not sure about this one, should we use DELETE request maybe?
         Route::post('openvidu/rooms/{id}/connections/{conn}/dismiss', 'API\V4\OpenViduController@dismissConnection');
+        Route::put('openvidu/rooms/{id}/connections/{conn}', 'API\V4\OpenViduController@updateConnection');
         Route::post('openvidu/rooms/{id}/request/{reqid}/accept', 'API\V4\OpenViduController@acceptJoinRequest');
         Route::post('openvidu/rooms/{id}/request/{reqid}/deny', 'API\V4\OpenViduController@denyJoinRequest');
     }
diff --git a/src/tests/Browser/Meet/RoomControlsTest.php b/src/tests/Browser/Meet/RoomControlsTest.php
--- a/src/tests/Browser/Meet/RoomControlsTest.php
+++ b/src/tests/Browser/Meet/RoomControlsTest.php
@@ -178,7 +178,6 @@
 
             // Test nickname change propagation
 
-            // Use script() because type() does not work with this contenteditable widget
             $guest->setNickname('div.meet-video.self', 'guest');
             $owner->waitFor('div.meet-video:not(.self) .meet-nickname')
                 ->assertSeeIn('div.meet-video:not(.self) .meet-nickname', 'guest');
diff --git a/src/tests/Browser/Meet/RoomSetupTest.php b/src/tests/Browser/Meet/RoomSetupTest.php
--- a/src/tests/Browser/Meet/RoomSetupTest.php
+++ b/src/tests/Browser/Meet/RoomSetupTest.php
@@ -370,4 +370,125 @@
             $browser->waitUntilMissing('@session .meet-subscriber:not(.self)');
         });
     }
+
+    /**
+     * Test demoting publisher to a subscriber
+     *
+     * @group openvidu
+     * @depends testSubscribers
+     */
+    public function testDemoteToSubscriber(): void
+    {
+        $this->assignBetaEntitlement('john@kolab.org', 'meet');
+
+        $this->browse(function (Browser $browser, Browser $guest) {
+            // Join the room as the owner
+            $browser->visit(new RoomPage('john'))
+                ->waitFor('@setup-form')
+                ->waitUntilMissing('@setup-status-message.loading')
+                ->waitFor('@setup-status-message')
+                ->type('@setup-nickname-input', 'john')
+                ->clickWhenEnabled('@setup-button')
+                ->waitFor('@session')
+                ->assertMissing('@setup-form')
+                ->waitFor('@session video');
+
+            // In one browser window act as a guest
+            $guest->visit(new RoomPage('john'))
+                ->waitUntilMissing('@setup-status-message', 10)
+                ->assertSeeIn('@setup-button', "JOIN")
+                ->clickWhenEnabled('@setup-button')
+                ->waitFor('@session')
+                ->assertMissing('@setup-form')
+                ->waitFor('div.meet-video.self')
+                ->waitFor('div.meet-video:not(.self)')
+                ->assertElementsCount('@session div.meet-video', 2)
+                ->assertElementsCount('@session video', 2)
+                ->assertElementsCount('@session div.meet-subscriber', 0)
+                // assert there's no moderator-related features for this guess available
+                ->click('@session .meet-video.self .meet-nickname')
+                ->whenAvailable('@session .meet-video.self .dropdown-menu', function (Browser $browser) {
+                    $browser->assertMissing('.permissions');
+                })
+                ->click('@session .meet-video:not(.self) .meet-nickname')
+                ->pause(50)
+                ->assertMissing('.dropdown-menu');
+
+            // Demote the guest to a subscriber
+            $browser
+                ->waitFor('div.meet-video.self')
+                ->waitFor('div.meet-video:not(.self)')
+                ->assertElementsCount('@session div.meet-video', 2)
+                ->assertElementsCount('@session video', 2)
+                ->assertElementsCount('@session .meet-subscriber', 0)
+                ->click('@session .meet-video:not(.self) .meet-nickname')
+                ->whenAvailable('@session .meet-video:not(.self) .dropdown-menu', function (Browser $browser) {
+                    $browser->assertSeeIn('.action-role-publisher', 'Audio & Video publishing')
+                        ->click('.action-role-publisher')
+                        ->waitUntilMissing('.dropdown-menu');
+                })
+                ->waitUntilMissing('@session .meet-video:not(.self)')
+                ->waitFor('@session div.meet-subscriber')
+                ->assertElementsCount('@session div.meet-video', 1)
+                ->assertElementsCount('@session video', 1)
+                ->assertElementsCount('@session div.meet-subscriber', 1);
+
+            $guest
+                ->waitUntilMissing('@session .meet-video.self')
+                ->waitFor('@session div.meet-subscriber')
+                ->assertElementsCount('@session div.meet-video', 1)
+                ->assertElementsCount('@session video', 1)
+                ->assertElementsCount('@session div.meet-subscriber', 1);
+
+            // Promote the guest back to a publisher
+            $browser
+                ->click('@session .meet-subscriber .meet-nickname')
+                ->whenAvailable('@session .meet-subscriber .dropdown-menu', function (Browser $browser) {
+                    $browser->assertSeeIn('.action-role-publisher', 'Audio & Video publishing')
+                        ->assertNotChecked('.action-role-publisher input')
+                        ->click('.action-role-publisher')
+                        ->waitUntilMissing('.dropdown-menu');
+                })
+                ->waitFor('@session .meet-video:not(.self)')
+                ->assertElementsCount('@session div.meet-video', 2)
+                ->assertElementsCount('@session video', 2)
+                ->assertElementsCount('@session div.meet-subscriber', 0);
+
+            $guest
+                ->waitFor('@session .meet-video.self')
+                ->assertElementsCount('@session div.meet-video', 2)
+                ->assertElementsCount('@session video', 2)
+                ->assertElementsCount('@session div.meet-subscriber', 0);
+
+            // Demote the owner to a subscriber
+            $browser
+                ->click('@session .meet-video.self .meet-nickname')
+                ->whenAvailable('@session .meet-video.self .dropdown-menu', function (Browser $browser) {
+                    $browser->assertSeeIn('.action-role-publisher', 'Audio & Video publishing')
+                        ->assertChecked('.action-role-publisher input')
+                        ->click('.action-role-publisher')
+                        ->waitUntilMissing('.dropdown-menu');
+                })
+                ->waitUntilMissing('@session .meet-video.self')
+                ->waitFor('@session div.meet-subscriber.self')
+                ->assertElementsCount('@session div.meet-video', 1)
+                ->assertElementsCount('@session video', 1)
+                ->assertElementsCount('@session div.meet-subscriber', 1);
+
+            // Promote the owner to a publisher
+            $browser
+                ->click('@session .meet-subscriber.self .meet-nickname')
+                ->whenAvailable('@session .meet-subscriber.self .dropdown-menu', function (Browser $browser) {
+                    $browser->assertSeeIn('.action-role-publisher', 'Audio & Video publishing')
+                        ->assertNotChecked('.action-role-publisher input')
+                        ->click('.action-role-publisher')
+                        ->waitUntilMissing('.dropdown-menu');
+                })
+                ->waitUntilMissing('@session .meet-subscriber.self')
+                ->waitFor('@session div.meet-video.self')
+                ->assertElementsCount('@session div.meet-video', 2)
+                ->assertElementsCount('@session video', 2)
+                ->assertElementsCount('@session div.meet-subscriber', 0);
+        });
+    }
 }
diff --git a/src/tests/Browser/Pages/Meet/Room.php b/src/tests/Browser/Pages/Meet/Room.php
--- a/src/tests/Browser/Pages/Meet/Room.php
+++ b/src/tests/Browser/Pages/Meet/Room.php
@@ -161,14 +161,19 @@
      */
     public function setNickname($browser, $selector, $nickname): void
     {
-        // Use script() because type() does not work with this contenteditable widget
-        $selector = $selector . ' .meet-nickname .content';
-        $browser->script(
-            "var element = document.querySelector('$selector');"
-            . "element.focus();"
-            . "element.innerText = '$nickname';"
-            . "element.dispatchEvent(new KeyboardEvent('keydown', { keyCode: 27 }))"
-        );
+        $element = "$selector .meet-nickname .content";
+
+        $browser->click("$selector .meet-nickname")
+            ->waitFor("$selector .dropdown-menu")
+            ->assertSeeIn("$selector .dropdown-menu > .action-nickname", 'Nickname')
+            ->click("$selector .dropdown-menu > .action-nickname")
+            ->waitUntilMissing('.dropdown-menu')
+            // Use script() because type() does not work with this contenteditable widget
+            ->script(
+                "var element = document.querySelector('$element');"
+                . "element.innerText = '$nickname';"
+                . "element.dispatchEvent(new KeyboardEvent('keydown', { keyCode: 27 }))"
+            );
     }
 
     /**
diff --git a/src/tests/Feature/Controller/OpenViduTest.php b/src/tests/Feature/Controller/OpenViduTest.php
--- a/src/tests/Feature/Controller/OpenViduTest.php
+++ b/src/tests/Feature/Controller/OpenViduTest.php
@@ -3,6 +3,7 @@
 namespace Tests\Feature\Controller;
 
 use App\Http\Controllers\API\V4\OpenViduController;
+use App\OpenVidu\Connection;
 use App\OpenVidu\Room;
 use Tests\TestCase;
 
@@ -554,4 +555,66 @@
         $room->refresh();
         $this->assertSame(null, $room->getSetting('password'));
     }
+
+    /**
+     * Test updating a participant (connection)
+     *
+     * @group openvidu
+     */
+    public function testUpdateConnection(): void
+    {
+        $john = $this->getTestUser('john@kolab.org');
+        $jack = $this->getTestUser('jack@kolab.org');
+        $room = Room::where('name', 'john')->first();
+        $room->session_id = null;
+        $room->save();
+
+        $this->assignBetaEntitlement($john, 'meet');
+
+        // First we create the session
+        $response = $this->actingAs($john)->post("api/v4/openvidu/rooms/{$room->name}", ['init' => 1]);
+        $response->assertStatus(200);
+
+        $json = $response->json();
+
+        // And the other user connection
+        $response = $this->actingAs($jack)->post("api/v4/openvidu/rooms/{$room->name}", ['init' => 1]);
+        $response->assertStatus(200);
+
+        $json = $response->json();
+
+        $conn_id = $json['connectionId'];
+        $room->refresh();
+        $conn_data = $room->getOVConnection($conn_id);
+
+        $this->assertSame($conn_id, $conn_data['connectionId']);
+
+        // Non-existing room name
+        $response = $this->actingAs($john)->put("api/v4/openvidu/rooms/non-existing/connections/{$conn_id}", []);
+        $response->assertStatus(404);
+
+        // Non-existing connection
+        $response = $this->actingAs($john)->put("api/v4/openvidu/rooms/{$room->name}/connections/123", []);
+        $response->assertStatus(404);
+
+        $json = $response->json();
+
+        $this->assertCount(2, $json);
+        $this->assertSame('error', $json['status']);
+        $this->assertSame('The connection does not exist.', $json['message']);
+
+        // Non-owner access
+        $response = $this->actingAs($jack)->put("api/v4/openvidu/rooms/{$room->name}/connections/{$conn_id}", []);
+        $response->assertStatus(403);
+
+        // Expected success
+        $post = ['role' => Room::ROLE_PUBLISHER | Room::ROLE_MODERATOR];
+        $response = $this->actingAs($john)->put("api/v4/openvidu/rooms/{$room->name}/connections/{$conn_id}", $post);
+        $response->assertStatus(200);
+
+        $json = $response->json();
+
+        $this->assertSame('success', $json['status']);
+        $this->assertSame($post['role'], Connection::find($conn_id)->role);
+    }
 }