https://support.kolabsys.com/provider?Action=AgentTicketZoom&TicketID=21437&ArticleID=76164&ZoomExpand=0#76164

The problem is:

• The user has his own identity and that of a delegator configured
• The user creates an event with his own identity as organizer and the delegator as attendee in his own calendar
• Because the delegator is recognized as one of the own identities, the event is (in this case incorrectly) filtered from the own calendar.

The solutions is:

• If we are the organizer, ignore the attendee status and show the event in any case in the regular calendar.
• Don't modify the logic of the open invitations calendar, so the event shows up in both calendars.