Significance: Nearly 600 years ago, Trà Cổ people built a communal house dedicated to the tutelary genies of the village. The festival is took place to memorize the merit of the tutelary genies of the village and pray good lucks for villagers.
Trà Cổ the site where one first places the pen on the map to draw the S-shaped character of Vietnam. The inhabitants of Trà Cổ originate from Đồ Sơn.
Quận He (Nguyễn Hữu Cầu), a leader of the peasants who rose up during the Lê - Trịnh period is also worshipped here. Representative of village communal house architecture of Vietnam, the building is still well preserved.
On the 25th day of the fifth lunar month, a procession of boats sails from Trà Cổ to the ancestors’ native land of  Ðồ Sơn. On the 30th day of the fifth lunar month, the boats return to Trà Cổ.
The next day, festivities begin with the procession of the King to the sea (also named the procession of the King to the shrine). It is accompanied by an armed troop, an orchestra, a strong and handsome young man chosen by the village population holding the flag and people carrying palanquin.
After the ritual procession, there are agricultural contests, such as a pig-breeding competition. The animals receive intensive care many months in advance from their masters in hopes of getting the first prize. There is also a cooking contest, with the best cooks acquiring fame throughout the village.
On the sixth day, the festivities conclude with a flower dance. In this ritual, the population pray to the genies to allow them to catch many fish, have good luck in their trading activities and to have a prosperous lives.