Hội Yến Diêu Trì (Holy Banquet for Great Mother and the Nine Goddesses), a great religious ceremony of Cao Dai, is annually held in Tây Ninh Holy See on the 15th of the eighth lunar month.
Most Caodaiists choose to go on a pilgrimage to Tay Ninh Holy Land on this day.
Hội Yến Diêu Trì originated in an event in 1925 when Cao Quỳnh Cư, Phạm Công Tắc and Cao Hoài Sang, through spirit communications, could contact with many spirit entities.
Instructed by God, they had a vegetarian meal to entertain Great Mother (Mẫu) and the Nine Goddesses.
Cao Dai believers are taught that Hội Yến Diêu Trì contains an esoteric practice that helps them to achieve their goal – to liberate themselves from the cycle of birth and death.