One of the most anticipated powwows of the year, the annual three-day gathering hosted by the Morongo Band of Mission Indians attracted more than 900 Native American dancers and 20 professional drum groups from across the U.S. Morongo Indian Reservation – More than 25,000 spectators gathered to reaffirm and celebrate Native American cultural traditions at the 29 th Annual Morongo Thunder & Lightning Powwow, held Sept.