Also, the recipes available to you are dependent on a number of factors, such as how many people are going to be at the event, how simple/fancy you want to get, budget, season, distance to the event, cooking tools you have available to you, etc.
Not knowing these variables makes it very hard to give you specific recipes. But I'll join Michael and throw out a favorite at pot lucks I've been to.
(an exerpt from one of my cookbooks);
Seeeeeeya; Goodweed of the North