Something that I looked into for the summer were Amusement park trips, bowling parties and skate parties. The skate rink that I was going to use offers fund raising opportunities and we would have made at least 1000 dollars if we sold a little over 100 tickets and we were allowed to have all sales made at the door. so walkins were ours.
Dances at a local rec center maybe with the local radio station up and coming djs might work. they did in a small town i use to live in.

good luck