Special event should available in weekend

[Chasu]

I think we get plenty of events already, mostly unscheduled admin shenanigans. When there's a larger event, it's gonna be announced in the discord anyway, so I don't feel like we should have an event routine like that. Also, people who could only/primarily play on weekends would only get event rounds. I wouldn't mind if events on the discord would be added to the forum calendar, though.