Genshi-sai Festival was added to taisai (grand festivals) in accordance with the 'Koshitu Saishi Rei' (the Ordinance of Imperial Household Religious Rites), which was established in 1908 as one of the 'Koshitsu-rei' (The Imperial Household Orders), and it became a public holiday in 1927.
明治41年（1908年）制定の「皇室祭祀令」（皇室令）において大祭に加えられ、昭和2年（1927年）に祝祭日となった。