Moose Lake Mafia Roller Derby battles Saturday at Riverside Arena in Moose Lake in a bout against the A-Town Roller Girlz of Aberdeen, South Dakota. After a hard-fought battle, the A-Town Roller Girlz were declared the winner. A portion of the proceeds will go to the Mercy Foundation. The Moose Lake Mafia Roller Derby team is set to take on the Goosetown Roller Girls Saturday, August 24 at Riverside Arena. Doors open at 6 p.m.