Unthanksgiving Day (orUn-Thanksgiving Day), also known asThe Indigenous Peoples Sunrise Ceremony, is an event held onAlcatraz Island inSan Francisco Bay to honor the indigenous peoples of the Americas and promote their rights.[1] It coincides with theNational Day of Mourning held inMassachusetts. The Alcatraz ceremony has been held annually since 1975 to commemorate the protest event of 1969, where theAlcatraz-Red Power Movement (ARPM) occupied the island.[1] It is organized by theInternational Indian Treaty Council and American Indian Contemporary Arts.[2]
The event is designed to commemorate the survival of Indian tribes following theEuropean colonization of the Americas. Organizers want it to serve in contrast andcounter-celebration to the traditional AmericanThanksgiving in which thePilgrims shared a meal with theWampanoag tribe.[3]

In 1969, a number of Native American members of theAlcatraz-Red Power Movement groupIndians of All Tribes (IAT) occupied the island of Alcatraz, under the terms of the1868 Treaty of Fort Laramie that allocated surplus government land to Native Americans. The occupation lasted for 19 months, from November 20, 1969, to June 11, 1971. They were visited by members of theAmerican Indian Movement (AIM) who, inspired by the occupation, led other protests, the first onThanksgiving in 1970 when they paintedPlymouth Rock red.[1] The latter protest continued as theNational Day of Mourning. The US government ended the Alcatraz occupation with force. During the occupation, hundreds of Native Americans joined the movement to speak out for their rights. This was part of a heavy period of Indian activism and protest at a time when thecivil rights movement in the United States amongst minorities was at a height.[4]
Every year on the date of the United StatesThanksgiving holiday in November,[5] several thousand indigenous people and spectators travel to Alcatraz Island. Groups dance before sunrise, to honor their ancestors, while other groups demonstrate other aspects of their cultures and heritage and speak out for the rights of their people.[6][7] The celebration is open to the public.
A similar sunrise ceremony at Alcatraz Island is also held onIndigenous Peoples' Day.[8]