I tend to go to the Zwift Events page when looking at activities but can't imagine why it would be any different than what is shown on the app. I can't see how many events occurred before the current hour but when I was scrolling through it this morning there just seemed to be so many events, but this might have been the reason why. This particular race has multiple start times so maybe that' what i was scrolling though which made me think, holy cow so many events going on through the day.