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 September 8, 1565 in what is now Saint Augustine, Florida. Despite scholarly research to the contrary, the traditional "first Thanksgiving" is venerated as having occurred at the site of Plymouth 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. Thanksgiving dinner is done in the evening, usually as a gathering of friends and/or family. At this time you say all your thanks and wishes.