I think depends on where you live but....
Next week we are doing a Philanthropy event with Stone Cold Creamery !! For all you that don't know it is an ice cream palor that you pick what toppings you want mixed into your icecream. Its a huge hit out here. (sorry for kinda being, 'duh' with that but I wanted to make things clear) Anyway my sorority will be there from 2-11 all day hanging out and even making ice cream.
We are going to get a huge portion of that day sales to give to the Phi Sigma Sigma Fondation. The monday before the event we are going to have the Cold Stone PT Crusier on campus with free samples. Its going to be great and is already making good PR with our posters and flyers. Its something fun and easy to do that doesn't involve a whole lot of work. Hope the idea helps