Andrew Olson fired an 824 series and Allison Dempski slammed a 711 to top Madison area youth scoring over the weekend, while Dan Lockman’s 804 and perfect games by Nate Sime and Thomas Rogers topped adult leagues. Olson chained games of 256, 269 and 299, leaving a 7-pin on his final ball, and Dempski rolled games of 269, 247 and 195, both at Prairie Lanes. Olson, who won the singles title at the U.S. High School Bowling National Championship last summer, earlier this season fired an 847...