Taking place during in the 2nd to 3rd lunar month, the festival derives from the cult of worshipping whale, also known as Ông Nam Hải (Mr. Nam Hải). Whale worship is a longstanding tradition of maritime communities along the Central coast. According legend and local belief, whales are savior of fishermen in the sea and bring about good fisheries. In Khanh Hoa Province, the festival begins with a Nghinh Ông (Whale Procession) Ceremony in the sea. To invite the whale spirit, the local fishermen make an offering ceremony on the sea. After that, 15 fishing boats, lining up in a V shape, make a parade on the sea, processing the whale’s spirit to his temple on shore. The festival subsequently continues with the royal decree procession ceremony. This is followed by a ritual inviting the spirit enter the temple. Lion and dragon dances, bá trạo singing and tuồng opera performances add a more joyful atmosphere into the festival.

Their most important ritual, is to say goodbye forever between the living and the dead so that the dead can return to eternity. They prepare elaborately months in advance, the most important of which is the Kagor - a wooden boat with many decorations, placed on the roof of the tomb. This is what remains of their sea memory. The ritual lasted for three days. On the first day, the incense holder holds a "spiritual spiritual object" as a ritual to inform the dead about the time, schedule and rituals of worship; worship Kagor. On the second day, they perform the ceremony of "beating pigs and chickens", eating together the last meal with the dead at the tomb, then singing all night so that the living and the dead are no longer entangled with each other. On the third day, they "offer the breakfast", the "Retirement Ceremony" with the rituals of "dividing wealth", "goodbye to Kagor" and "terminating".

The ceremony is usually held by the tribes that have soldiers in the ancient Paracels on the occasion of their "marriage service", around March 15-16. They made 5 models of boats, sacrifices, tablets of soldiers and gods who ruled the sea. The village communal house sanctuaries held the sacrifice ceremony the night before and the ceremony to pray for the spirits of the soldiers of the Hoang Sa team. The ceremony is held in the courtyard of the communal house and is performed by the clans and the shaman. 05 models of fishing boats placed in front of 3 altars. After the shaman performs the rituals of catching the exorcism seal, the blessing is a ritual reading. Then, they performed the ritual of releasing the sacrificial boat into the sea. During the ceremony, there is a festival of lanterns, boi singing, lion dance, procession and traditional boat racing festival.

The festival takes place in Kiếp Bạc Temple in the autumn from the 15th to 20th of the eighth lunar month in honoring the legendary General Trần Hưng Đạo, also known as Saint Trần, who defeated the Mongol invaders three times back in the 13th century. To many, Saint Trần is also worshipped as Father, serving as their protective spirit. In feudal society, the festival was part of an annually national ceremony and officiated by a mandarin dispatched by the King. The most important ritual of the festival is the procession of offerings on boat along Lục Đầu River. It is an honor for anyone in the commune to be selected to prepare for and row boats. The boats are decorated with red fabric strips on the sides and with followers and lanterns on board. Especially, the dragon palanquin boat is decorated with yellow fabric strips and flowers. The ritual starts with Saint Trần’s tablet being processed onto the golden-gilded palanquin, from the main temple building passing through the Tam Quan Gate towards the river. The procession takes about two hours along the river.