 Don't pay for your sports coverage. Your greater Grand Forks sports leader is free to you, video and radio. KNOX and KNOX Live Sports. It's another great day in fertile Minnesota at the Polk County Fair. You'll always find daily free stage events, the talent contest, and the PRCA Rodeo in front of the Grandstand. Start at 7 p.m. tonight. Baja Racing Friday and Saturday. And Sunday, it's the Super Demo Derby.