also: しんじょうさい
noun
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.
新嘗祭は毎年11月23日に行われる宮中祭祀です。
The Niiname-sai is an imperial court ritual held every year on November 23rd.
天皇陛下が新嘗祭で新穀を神々に供えられました。
His Majesty the Emperor offered the new grain to the deities at the Niiname-sai.