If you activate one of the event spawn points and then run away it despawns the event spawn point. People are abusing this to shut down the event for everyone.
If you can’t fix this obvious design flaw you should simply give the people who are doing this a temporary ban that lasts until the event ends. It’s really an easy thing to fix.
There is no good reason for the event to de-spawn, other than appeasing trolls. Then again I see no good reason to do the event more than once a day, so it isn’t really bothering me much.