Madison police are expecting a much tamer Freakfest on Saturday than the violence-riddled Halloween celebrations of years past, but they are still having a COW. The Cell on Wheels ? a mobile tower and electronic radio transceiver on a truck about the size of a semi that will be parked in the Buckeye Lot at 214 W. Gorham St. ? will enhance cellphone coverage for social and public safety purposes as thousands of costumed revelers descend on the State Street area, said Central District Capt. Carl Gloede.