UI issue: general issues when editing an event
This is an issue/bug i've experienced on mobile versions of Chromium, and it's not consistent, so I don't know the exact circumstances to replicate it.
Occasionally when editing the description or image of a previously-created event, I will hit Save and instead of saving the changes to the event, I will be jumped up to the event's Title textbox which becomes active. It is as though I can't save the event because I havn't entered a title, or because the entered Title is invalid somehow, but there is no indication of this besides the point of focus and activation being jumped there. And I'm editing an event, and havn't changed the Title anyhow, so there is no reason to expect there to be a problem with the Title. Scrolling down and hitting Save at this point will not work, I will once again be jumped back to the Title textbox. At this point if I hit Enter from the Title textbox, which moves my focus to the Where textbox, I am then able to scroll down and successfully Save the event.
So i suspect under certain circumstances when editing an event, the flow is broken and the UI behaves as though no Title was entered, and won't let the user Save the event until they enter a valid title. That's my guess. Sorry this isn't more helpful, perhaps someone else has experienced this. I will try to add more documentation as I continue to encounter this bug.