The Sacred Sundance: The Transfer of a Ceremony 2008 on netflix

This feature-length documentary chronicles the Sundance ceremony brought to Eastern Canada by William Nevin of the Elsipogtog First Nation of the Mi’kmaq. Nevin learned from Elder Keith Chiefmoon of the Blackfoot Confederacy in Alberta. Under the July sky, participants in the Sundance ceremony go four days without food or water. Then they will pierce the flesh of their chests in an offering to the Creator. This event marks a transmission of culture and a link to the warrior traditions of the past.