When you are adding participants to an event and check the availability you can not change the selected date.

Steps to reproduce:

1. Create an event.
2. Add participants.
3. CLick on "check availability".
4. In the bottom left corner you can see the date and time you selected.
5. You want to change the time because at the selected time the participants aren't free.

Actual results:
You can not click and change the time, instead you have to close the window and go back to the create tab.

Expected results:
You can just click and change the date or time.