Wikipedia
Kuksu, also called the Kuksu Cult, was a religion in Northern California practiced by members within several Indigenous peoples of California before and during contact with the arriving European settlers. The religious belief system was held by several tribes in Central California and Northern California, from the Sacramento Valley west to the Pacific Ocean.
The practice of Kuksu religion included elaborate narrative ceremonial dances and specific regalia. The men of the tribe practiced rituals to ensure good health, bountiful harvests, hunts, fertility, and good weather. Ceremonies included an annual mourning ceremony, rites of passage, and intervention with the spirit world. A male secret society met in underground dance rooms and danced in disguises at the public dances.
Kuksu has been identified archaeologically by the discovery of underground dance rooms and wooden dance drums.