Events have more advanced settings, you need to click on the star button on the right bottom.

Thanks!
Allow me to change this to a new feature request then:
After a season is completed, it might be nice to have a "purge old events" button that could purge all events from the previous season, so I don't have to go through each event and remove them one-by-one.
Or else perhaps have the myTOA events organized by season, or sorted with the most recent event at the top??

I think the best way to tackle this would be to, at the beginning of each season, put a card on the user's myTOA dashboard stating "Hey, it's a new season. Would you like to clear your favorite events?" or something along those lines.