One of the most popular festivals in Vietnam is Tet Nguyen Dan, also known as Tet, which is the Vietnamese New Year. It is the most important holiday in Vietnamese culture and is celebrated with great enthusiasm and excitement.

Tet usually falls in late January or early February and marks the beginning of the lunar new year. The festival lasts for several days and is a time for families to come together, honor their ancestors, and welcome the new year with hope and good fortune.

During Tet, people clean and decorate their homes, visit temples and pagodas to pray for blessings, and prepare special foods to offer to their ancestors. One of the most iconic traditions of Tet is the giving of red envelopes containing money, known as "li xi," to children and elders as a symbol of good luck and prosperity.

Throughout the country, there are colorful parades, dragon dances, fireworks displays, and other cultural performances to mark the occasion. Streets are lined with flowers, particularly peach blossoms and kumquat trees, which are believed to bring good luck for the new year.

Overall, Tet Nguyen Dan is a time of joy, renewal, and celebration in Vietnam, and is a wonderful opportunity for visitors to experience the rich traditions and customs of the Vietnamese people.