I also noticed a weird behaviour related to times and timezones when creating Wiki Data Days 2020 . The times with which it was created were not those that I have initially selected, and the timezone shows “UTC+1”, even if mine is UTC+0, which is confusing.
One thing to keep in mind is that the calendar allows you to create an event in a different timezone than your own, but then, once the event is created, it will display the event to you in your local timezone. I’m not sure this is what is happening in your case @Darwin, since I don’t believe you are in UTC+1 timezone. I did try to reproduce the issue, but it worked fine for me:
I created an event in UTC+0 at 11am, saved it.
It displayed to me in UTC-8 (my timezone) at 3am.
It now seems to be working fine, thanks!