In first grade I used to have mini corn muffins, "butter" (soft spread), dried fruit (like raisins), a tiny sliver of pumpkin pie w/whipped cream (they love the little squirt), and a few nuts (if no one was allergic). We would discuss the significance of the food, and everyone would help serve. It was cheap because they only got a tiny bit.

They made place mats to make it more festive.