I think you’re on to something, but it’s still not there. I did have a page called events, and I deleted it. I then flushed the permalinks as you described, but now instead of showing nothing it shows my 404 nothing found response.
I have been testing various things, so it was probably on list when you tried. It’s now on month view. I deactivated the event rocket plugin so, I’m curious if you see anything now. I can’t see past events or anything unless that plugin is enabled. There is no customizations…I even deleted and reinstalled and still have this issue.