Not RC's, but we had a great time at the Hobie North Americans at Harrison, BC last year. All sailors were given a styrofoam block and material to make a sail boat. The race was on a pool with box fans for wind. Round robin races with two at a time. Winner advanced. Race went at least ten rounds. Some made cats, simple design was winner. Great fun for an evening event.
Caleb Tarleton H-17 6446