Powwows are social gatherings of Native American during which traditional
arts and crafts are displayed, often for visitors from outside the tribe. 
Most powwows feature the style of dancing and singing particular to the
tribe hosting the powwow.  Competitive dancing in local costume is also
common.  Major powwows of the Sioux tribes, such as the one pictured
above, are held each summer at the Cheyenne River and Brule Sioux Indian
reservations in South Dakota.  The powwow is descended from the Sun Dance,
for which separate tribal groups would gather in the summer to hunt,
socialize, and perform rituals meant to renew nature, keep buffalo
plentiful, or bring victory in war.