Have you ever thought of hosting a Charity Dinner? You can donate partial proceeds to charity, and keep some for the chapter.
Basically, all you do is arrange with a restaurant to host a dinner there, and hopefully they'll give you a really good deal on the meal. Then you advertise like mad, and sell as many tickets as you can. We've done dinners before at my chapter, and if you've got a good group effort the night can be very very successful.
Depending on where you hold it, the dinner can be a casual affair, or a more formal one. . . another idea is to combine a dinner and silent auction--girls can donate items themselves, or you can get local businesses to donate items to be auctioned off. . . these can make a ton of money.
Hope these ideas help!
Nancy