Thay pagoda is located in Sai Son (Quoc Oai. Son Tay). The festival is celebrated on the 5th-7th days of the 3rd lunar month (with the 7th day being the main day) in honour of TO Dao Hanh (See Thay pagoda). At the pagoda, the ceremony is dedicated to Buddha (in particular, the rituals of circuiar movement performed by monks). Offerings are all vegetables, rice cakes in the form of a truncated cone (oan), bananas and other fruits, and flowers. After the ceremony, pilgrims climb up the mountain to visit different temples and grottoes. The Heaven Market at the summit is said to be a place where immortals used to play chess. Cac Co grotto attracts many boys and girls who come looking for good luck. Bones discovered here are probably the remains of soldiers of Lu Gia, the patriotic mandarin who fought against the Chinese Han aggressors in the 2nd century B.C. Well- known water puppetry is performed in the pond before the pagoda.
