Sun Dance, most important religious ceremony of the Plains Indians of North America and, for nomadic peoples, an occasion when otherwise independent bands gathered to reaffirm their basic beliefs about the universe and the supernatural through rituals of personal and community sacrifice. Traditionally, a Sun Dance was held by each tribe once a year in late spring or early summer, when the buffalo congregated after the long Plains winters. The large herds provided a plentiful food source for the hundreds of individuals in attendance.
(Encyclopædia Britannica)
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