The Tết Nguyên Đán festival, or Vietnamese New Year, celebrates the arrival of spring and the start of a new lunar calendar year. It includes various customs like family reunions, the preparation of special foods, and paying respects to ancestors. Traditional practices encompass activities like cleaning homes to sweep away bad luck and decorating with peach blossoms and kumquat trees. The festival promotes feelings of renewal and hope, emphasizing the importance of family and cultural heritage in Vietnamese society, creating a festive atmosphere filled with joy and togetherness.