Wikipedia
Chuseok , originally known as hangawi (한가위 from archaic Korean for "the great middle (of autumn)"(한가위), is a major harvest festival and a three-day holiday in Korea celebrated on the 15th day of the 8th month of the lunar calendar. Like many other harvest festivals around the world, it is held around the autumn equinox.
Chuseok, as well as the days before it and afterwards, are statutory holidays in South Korea. Within East Asia, the timing coincides with that of the Chinese and Vietnamese Mid-Autumn Festival, as well as the Japanese Tsukimi. The festival is derived historically from the Chinese Mid-Autumn Festival, which is evident in the similar practices, food, and folklore between the two.
As a celebration of the good harvest, Koreans visit their ancestral hometowns and share a feast of Korean traditional food such as songpyeon (송편) and rice wines such as sindoju and dongdongju.