Before start playing DWO, I was playing Shin Megami Tensei : Imagine
MegaTen have a very nice forum event system, events in game like take screenshot of something, make a story, find something, make a picture, make cookies with your sign in the pic, etc.
The simplest of them have every week.
And have prize for participate and a better prize with a raffle.
You can also check MegaTen forum : http://www.aeriagames.com/forums/en/index.php?f=451