The ninth annual Mitten Kitten Mash Up 9 Lives roller derby tournament is set for October 4-6 at the Summit Sports and Ice Complex in Dimondale. There will be 25 teams in the field and there are two divisions of the state's top adult teams. It will be the largest Michigan roller derby event ever held. There will be 500 plus skaters, 100 officials and dozens of production staff. Event pricing includes $15 for the day online and $18 at the door or $35 for the week end.