Find a fried chicken joint and buy some rolls or biscuits whatever their specialty is
KFC has em

It is a potluck, which is luck of the draw. Someone wants you to bring food they get a potobadluck with some cold KFC biscuits

Some local joints here do some very good rolls, that would be much better, but KFC is nationwide. Along the same lines maybe you could go to a store or bakery and get some nice cranberry walnut bread, kalamata olive bread, or one of my holiday favs a Pistaccio and dried cherry bread, these hold up well enough to not be served hot, and are good with most foods served.