 The granddaddy of them all is happening tonight at the Polk County Fair in Fertile, Minnesota. It's super demo derby action in front of the grandstand starting at 6.30 p.m. Enjoy the last day with the midway opening at noon, plus the parade and best fair food around. Hurry in before all the fun ends and watch the fireworks starting at 10.30. The Polk County Fair in Fertile, Minnesota, the home of family fun. It's a big time, fun time, show time, fair time. It's a time for you and me.