Witness soapbox shenanigans at the 2012 Red Bull Soapbox Race at Piedmont Park. This year, 40 teams will race their human-powered go-kart contraptions down 10th Street in pursuit of eternal glory — and the grand prize, a ride with a professional Red Bull off-road truck driver. Teams are judged on three criteria: creativity, showmanship, and speed. Free. Sat., June 9, 10 a.m. Piedmont Park, 1071 Piedmont Ave. 404-876-4024. www.piedmontpark.org.