Mississippi Valley Mayhem, La Crosses very own local roller derby league presents Skate Jam and will square off against S.C.A.R. Dolls (St. Cloud Roller Derby) from St. Cloud, Minnesota on August 16th at the Onalaska Omni Center. Doors open @ 6PM, Bout begins @ 7PM. Tickets are available at the door for $9/adult. You will receive ...