I'm not sure if your school allows themes for philanthropy day, but we did this during a C.O.B.:

We had a Casino Night theme. Some of our sisters are in the hospitality and tourism major, so they got real table tops for like black jack, craps, and roulette. If you don't have this resource, you can fins stuff like that in prom catalogues.

Anyway, so in different rooms of the house, we had different games set up. You play about 3 rounds with the PMNs of each game, then they get a little toiletry to go in a bag. Ater going to all the rooms and playing all the games, they all had bags full of toiletries to decorate and then we donated them to the local women's shelter. All the "dealers" and people handing out drinks and stuff wore black pants, a button up white shirt, and really cute cheap sparkly bowties.

Hope that gives ya some ideas!