With the success of shows like The Great British Bake-Off, you should find it easy to get participants for this one! Get a panel of judges (or ask the public to vote) on a variety of baking categories. You can even sell the top performing entries off afterwards for some extra funds, and hold this in tandem with the craft fair or another similar event mentioned above to boost the attraction.
Trivia Night
People pay for trivia at bars and restaurants, so invite them to pay to play for Relay For Life. Consider adding some questions specific to cancer or your community for