First, sounds like Boyne City is getting a mtb race at Avalanche Mountain. Format sounds like it is to be determined, but for those that haven't ridden out there, the 5 mile lap is roughly 4.5 miles of climbing and a nasty fast 0.5 mile descent. From the website:
"The Avalanche Challenge is a mountain bike race that will take place at Boyne City’s spectacular Avalanche Preserve Park the first Saturday in June. Riders will race on the park’s scenic, twisting, uphill single track in a 5 mile time-trial format racing at intervals one at a time against the clock.
Spectators and racers will experience breathtaking views of Lake Charlevoix in a festival atmosphere with live entertainment, food and beverage tents.
Avalanche Challenge is part of Boyne City’s cycling weekend which includes a downtown criterium on Sunday and other activities."