Catch the buzz as the Twister City Roller Derby put on an electrifying dance of athleticism and grace when jammers and blockers race against each other and the clock. Head to the OKC Farmers Public Market to witness a full-contact race on skates. Once the whistle blows, watch as the Twister City Roller Derby’s jammer struggles to fight her way through the opposing team’s four blockers, scoring points off each one she passes before the timer runs out.