Coordinate a Restaurant Night
Ask local restaurants if they would be willing to donate a portion of their earnings on a specific night to your cause or organization. Create flyers for the events and advertise heavily in your school and neighborhood for that night. Ask if the restaurant can advertise on their tables for you leading up to and during the night. Also, if they offer specials that night, that might create further incentive for people to come and enjoy a good meal for a good cause.