What festival is it to eat glutinous rice balls on the fifteenth day of the first month?

Eating glutinous rice balls on the fifteenth day of the first month is the custom of the Lantern Festival.

Lantern Festival, also known as Shangyuan Festival, Xiaoyuanyuan Festival, Yuanxi Festival or Lantern Festival, is the 15th day of the first lunar month and the last important festival of China Spring Festival. Lantern Festival is one of the traditional festivals in China, Chinese character cultural circle and overseas Chinese. The first month is the first month of the lunar calendar. The ancients called "night", so the fifteenth day of the first full moon in a year was called Lantern Festival.

Since ancient times, the custom of Lantern Festival has been based on the warm and festive custom of watching lanterns. Traditional customs include going out to enjoy the moon, lighting lanterns and setting off flames, liking solve riddles on the lanterns, eating Yuanxiao and pulling rabbit lanterns. In addition, in many places, traditional folk performances, such as playing with dragon lanterns, playing with lions, walking on stilts, boating, yangko dancing and playing Taiping drums, have all joined the Lantern Festival.