The festival, commonly known as pest-killing festival, is held annually on the fifth day of the fifth lunar month. It is a traditional celebration in many Eastern Asian countries, including Vietnam. During feudal dynasties, the event was celebrated differently among royal families and ordinary people. Under the Revival Le dynasty, the King and royal family usually prepared offerings for their ancestors during the festival. At the same time, they also held a ceremony to present fans for civil mandarins and military mandarins. This was a sign of care as the time of the festival is usually in the midst of the hot summer in the country. On this day, people often cook traditional dishes to offer to ancestors, and pray for good health, bumper crops, good business, and good luck in a new season. Apart from typical fruits like lychee and plum, fermented glutinous rice is an indispensable part of this occasion./.