Cua Ong Temple Festival takes place from the 2nd day of the first lunar month to the 30th day of the third lunar month in Cam Pha city, Quang Ninh province. The main festival day is on the 3rd of the second lunar month.

Cua Ong Temple is dedicated to Tran Quoc Tang, the third son of Tran Hung Dao, many generals of Tran Dynasty and Hoang Cau was a local general who fought bravely against the Chinese invaders.

Every year, the festival is held at the temple to commemorate his merit of defeating the aggressors and defending the Northeast region. This is one of very big festivals in Quang Ninh with incense offering ceremony and a procession of his votive tablet from Cua Ong Temple to the shrine in Trac Chan Commune (called Vuon Nhan), according to the legend, is the place where Duc Ong was embodied and drifted. Then the procession turns back to the temple, symbolizing the royal progress of the Duc Ong.