Decorate meeting hall to look like “Arnold’s” from “Happy Days”. Have you youth group dress up like car hops to serve. Make a short menu. Most items can be donated by teens or by local businesses. Play 50’s and 60’s music (check the words before you play them). Have contests like bubble blowing, hoola hoop, limbo, or what ever you can think of. Costume contests work well also. If you have access to a vintage car and a camera you can make a few $$ by selling pictures also. We charge a $0.50 door charge also and award prizes for all the games that we do.
The more you promote it the better $$$ you can make. I’ve done this in very small churches and made a few hundred $$$. Making malts and floats in the malt shoppe is the best part. The older folks like to remember when and the younger ones like to try to immitate the age. It’s alot of fun and a good way to raise $$$. (Another cool thing to do is to have a live band or a juke box!)