Thanksgiving, or Thanksgiving Day, is a traditional North American holiday, which is a form of harvest festival. The date and whereabouts of the first Thanksgiving celebration is a topic of modest contention, though the earliest attested Thanksgiving celebration was on 8 September, 1565 in what is now Saint Augustine, Florida. Despite any scholarly research to the contrary, however, the traditional "first Thanksgiving" is venerated as having occurred at the site of Plimoth Plantation, in 1621.
Today, Thanksgiving is celebrated on the second Monday of October in Canada and on the fourth Thursday of November in the United States.