On the event page each category has a Clear All button at the top but it only clears one. While on some events I never plan to use that feature other it would be very helpful if it worked.
And the easier it is to delete the more likely it is I will take the time to do it instead of allowing hundreds if not thousands of events to pile up.
On that note it would also be helpful if dances were a separate category so they are easier to delete.