The Navajo Nation Rodeo Association welcomed the Indian National Final Rodeo Tour to Vermillion Cliffs Arena over Mother’s Day weekend for three full days of rodeo action, including a special open bull riding event hosted by the K.E.Y. Ranch.The Navajo Nation Rodeo Association welcomed the Indian National Final Rodeo Tour to Vermillion Cliffs Arena over Mother’s Day weekend for three full days of rodeo action, including a special open bull riding event hosted by the K.E.Y. Ranch.