Tết Đoan ngọ in Vietnam
Tết Đoan ngọ in Vietnam is held on June 10. Celebrated on the 5th day of the 5th lunar month. This event in the first decade of the month June is annual. 
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Literally, Tet refers to festival, Doan means the start, Ngo is the seventh animal of the Chinese zodiac- the horse. Doan Ngo festival is also known as Tết sâu bọ (sâu bọ = worms, pests) or Tết tháng 5, to be celebrated on the 5th day of the 5th lunar month.
The name “Tet sau bo” derives from the fact that farmers, on this day, get rid of all pests to start growing their crops for the new season. Therefore, creatures and people must become stronger in both their health and their souls to overcome this. On this occasion, the whole family have to get up early and eat fermented sticky and fruits. The worshipping is held at noon, hour of Ngo. The tradition of eating dumplings, especially lye water dumplings, extends from the belief that the dumplings will cleanse one’s body of any unwanted “parasites”.
Source: vietnamdiscovery.com
Similar holidays and events, festivals and interesting facts
Hồ Chí Minh's Birthday in Vietnam on May 19
Dragon Boat Festival or Duanwu Festival on June 10
Family Day in Vietnam on June 28
Martyrs and Wounded Soldiers Day in Vietnam on July 27
Victory Day in Cambodia, Laos and Vietnam on August 1
August Revolution Commemoration Day in Vietnam on August 19
National Day in Vietnam on September 2 (celebrates the independence of Vietnam from Japan and France in 1945)