2019 Pi-Ume-Sha Treaty Days Pow Wow Celebration Rate This Event All are welcome at the 50th Annual Pi-Ume-Sha Treaty Days Pow Wow Celebration on June 28-30, 2019 at the Pi-Ume-Sha Powwow Grounds behind the Warm Springs Community Center in Warm Springs, Oregon. The event commemorates the signing of the Treaty of 1855 between [read more]