Hoi Giong is a traditional annual festival held in many places in Hanoi to commemorate and celebrate the feat of legendary hero Thanh Giong, one of the immortals of Vietnamese folk beliefs. According to Nguyen Van Huyen, "the organization of Assembly as today began from the 11th century, Ly Thai To". Ly Cong Uan before founding the Ly dynasty lived in Kien So Pagoda, near the Temple of Phu Dong and often came here to offer incense wishes gods know the fate of the country. After entering the throne, Ly Thai To ordered the embellishment, expansion of Phu Dong Temple and regulations on the organization of the festival. According to Cao Huy Dinh, "Because the center of Asia is the place that has associated its social and natural characteristics with the life and miracle of the Gorge, where the temple was built majestic majesty and opening ceremony. annual. The temple and the association have engraved into the eternal memory of the people of the hero's brilliant image.

Hoi Giong is a traditional annual festival held in many places in Hanoi to commemorate and celebrate the feat of legendary hero Thanh Giong, one of the immortals of Vietnamese folk beliefs. According to Nguyen Van Huyen, "the organization of Assembly as today began from the 11th century, Ly Thai To". Ly Cong Uan before founding the Ly dynasty lived in Kien So Pagoda, near the Temple of Phu Dong and often came here to offer incense wishes