S.F.
When I read your post my first thought since the birthday boy likes sports, is to make what you would make for a superbowl party. Maybe even decorate in the color of the bears or which ever team he likes. You can make Chili or sloppyjoes, chips and dips, a big tray of lasagna. Or if he likes a team from another state make the foods that are normally found there.
Have Fun!