If you’re a fan of roller derby, or if you’re curious about the sport, there’s a doubleheader today at the Pipkin building on the fairgrounds. Doors open at 5, first match at 6. $10 to get in, $5 for kids and there will be beer and Chuck’s BBQ. After the second match, there will be a party Downtown in Rockbottom, the downstairs bar inside Rehab Disco on Front Street.