November 23rd is Labor Thanksgiving Day.
November 23rd is Labor Thanksgiving Day,
which was established as a national holiday to stress the importance of labor in people's minds.
This day was originally called Niinamesai, or "Harvest Festival," until the end of the Second World War. It's when the emperor dedicates the year's rice and sake to Amaterasu-Ohmikami, the Goddess of the Sun, and the other Shinto gods while he eats and drinks.
This practice became standard in the 7th century and is still done today in the Imperial Palace.