The 2012 article United American Indians of New England Commemorate a National Day of Mourning on Thanksgiving by Simon Moya-Smith says:

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"For the past 42 years, members and supporters of the United American Indians of New England (UAINE) have assembled every Thanksgiving at Cole’s Hill in Plymouth, Massachusetts, to commemorate a National Day of Mourning.

Established in 1970, the National Day of Mourning aims to publically combat the erroneous stories and miscomprehensions engulfing the First Thanksgiving. Born as the result of “the suppression of the truth,” according to UAINE’s website, the day is also meant to mourn the loss of the millions of American Indians who have died as a result of European settlement.

This year’s 43rd commemoration, scheduled for noon Thursday, is dedicated to American Indian Movement leader and political prisoner Leonard Peltier. Peltier, whose next parole hearing is scheduled for 2024, has been in various federal penitentiaries since his first-degree murder conviction in 1977. Moonanum James, UAINE co-leader, and a member of the Wampanoag Nation, said that Peltier has sent UAINE a statement to be read at the rally every year since the 1980s.

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Following the speak out, the participants will march up the historic district of Plymouth on Main Street, which bisects the life-size replica of the historic Mayflower vessel.....A rally at Plymouth Rock will immediately follow the march and will include speakers of American Indian parentage. A potluck social will follow the day’s events."​

The Democracy Now video shows of the 2011 National Day of Mourning.​
 

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