Halloween usually falls on a weekday, so most are "dead on their feet" from working all day. Set up a low maintenance buffet.
Food that you can prepare in advance and will serve a lot of people at the party, such as a soft cheese spread prepared in a skull bowl, is perfect!
I found this incredible webstore, Pushin’ Daisies, that sells skull pans, skeleton gelatin molds, and much more in the way of mortuary novelties. Pick up a couple of skull pans, and use one for the skull-mold cheese dish, and the other one to make a spooky skull cake for dessert.
Round out the buffet with veggies and dip, and some “food on the bone,†such as Buffalo wings.