>>264849219
No one can enforce events either way. If you're capable of convincing people to make a themed avatar, anonymously or not, and you claim a day for that event to be held on, you have an event.
Good luck what with all this event bloat, though. Better to try for the first half of the year, now that we're in Q4 we have school/halloween/thanksgiving/christmas/new years back to back, whether you like it or not, because those are already circling through people's minds without you saying a thing.