CHEYENNE, Wyo. — More than 100 relay teams representing 15 tribal nations will descend on Frontier Park this fall as the Indian Relay Championship of Champions celebrates its 10th anniversary in a new host city. Relocating from the Central Wyoming Fairgrounds in Casper, the three-day “extreme sport” showcase is scheduled to take place Sept. 25–27 in Cheyenne. Performances will kick off at 2 p.m. daily. The championship has historically rotated t…