>>278526360
The more people that can join an event voluntarily, the more people will get enjoyment of something, the better it is for everyone. Those that don't want to go to the event can easily ignore the posts as the post count is not a lot, while those that would've liked to join the event are reminded of it every once in a while and those that rarely go to the thread can still spot it when the event draws nearer.

It's a simple system that makes everyone with a clear mind happy and taken into consideration.