... heeeey this is a good idea. like, obviously it should be made a point that people shouldn't only update in the interest of playing the events, but i think it's a really good idea!
mentioning any upcoming events at least twenty four hours before they happen's a good idea too, though some overlaps in events would be.... somewhat amusing, i think. and it'd be good if you've got some muse block or something. it might free up your imagination or whatever.
and i agree with mini!wata-mun about the events being a good way for people to play an effect rather than rush and do it because the event'll disappear again.