You could make chicken wings, piggies in a blanket, chips and dip, or other types of finger food.
Crab dip & hot spinach & artichoke dip.
I'm planning a Christmas party and I have no clue what food to make/buy. It's going to be about 15 people between the ages of 15 and 18. It's going to be a casual party and I prefer snacks over meals. Any ideas are appreciated, thanks!