When was the first Thanksgiving celebration? What really happened, contrary to popular belief?
Most likely, October 1621.
The year is not in doubt but the month is as records of the event are sparse.
The meal itself is a mystery although it was likely full of lots of fish, lobster and venison along with corn and root vegetables.
The only popular belief I can think of is turkey. We do not know if there was one at the feast but it certainly was not the center of the feast if there was one.