I have a layout of what could be done. The main theme could be a masquerade through the main streets of Menewsha. Everyone who wants to participate dresses up in a "costume". It could be as simple as mixing a few colors, or incorporating a real theme into it.

Game Ideas:

Menewsha Trivia
(done at V-Day event and looks fun!)

Costume Contest
(every masquerade needs a costume contest)

Story Writing Contest
(a one page story about one's masquerade adventures)

Those were just some ideas I thought I should put out there. Not really original. Though I really love the trivia game idea, I think it would be awesome in this kind of event. If the game was taken and placed in the event I could host the thread. That is only if you like it though. I love the cake contest idea, I think it would be real hit with members!