also: しんじょうさい
Niiname-sai; Harvest Festival
An imperial Shinto ritual held annually on November 23rd (Labor Thanksgiving Day), in which the Emperor offers newly harvested rice to the deities and partakes of it himself. The term is specific to this ceremony.
The Niiname-sai is an imperial court ritual held every year on November 23rd.
His Majesty the Emperor offered the new grain to the deities at the Niiname-sai.