Saitansai (a Shinto ritual to mark the beginning of New Year followed by a special sharing of sake (rice wine) in the barrel and a mochi (rice cake) pounding ceremony) is one of the holidays designated by the Koshitsu Saishi Rei (Imperial household religious rites ordinance) as a festal day, which were celebrated before World War II.
歳旦祭（さいたんさい）は、戦前の祝祭日の中の皇室祭祀令に基づく祭日の一つ。