The Mid-Autumn festival is named “Tet Trung Thu” in Vietnamese.
Tet Trung Thu is formerly autumn festival, and then becomes tet trong trang (moon looking festival) of children. On this day, the moon is the brightest and roundest in the year, cool weather. The festival involves the custom of trong trang, procession of lights (parading with lanterns shaped as moon and stars), lion dance and eating pasties and fruits.
The Vietnamese version of the holiday recounts the legend of Cuoi, whose wife accidentally urinated on a sacred banyan tree, taking him with it to the Moon. Every year, on the mid-autumn festival, children light lanterns and participate in a procession to show Cuoi the way to Earth.
In Vietnam, Mooncakes are typically square rather than round, though round ones do exist. Besides the indigenous tale of the banyan tree, other legends are widely told including the story of the Moon Lady, and the story of the carp who wanted to become a dragon.
One important event before and during Vietnamese Mid-Autumn Festival are lion dances. The dances are performed by both non-professional children group and trained professional groups. Lion dance groups perform on the streets go to houses asking for performing. If accepted by the host, “the lion” will come in and start dancing as a wish of luck and fortune and the host gives back lucky money to show thankfulness.