Events,
totally random? probably.
Conviniently timed when people arent on? Most Probable
So heres an idea, it may be kinda hard but... try Planning events ahead and Posting them? maybe a week in advance? even a day or two really, is it really that hard? just Say the Time(time zone) Prize and any other info you might add such as the type of event.
Now I only say this because I have never seen a post about an event(happening the next day) I think I saw One with an Hour notice but thats about it
And yes I know im Crazy for this insane idea, what was I thinking