The origin of Lantern Festival is introduced in English:

Lantem Festival the 15th day of the 1st lunar month.

The 15th day of the 1st lunar month is the Chinese Lantern Festival because. the first lunar month is called yuan-month and in the ancient times people called night Xiao. The 15th day is the first night to see a full moon. So th e day is also called Yuan Xiao Festival in China.

According to the Chinese tradition, at the very beginning of a new year, when there is a bright full moon hanging in the sky, there should be thousands of colorful lanterns hung out for people to appreciate. At this time, People will try to solve the dumplings on the lanters and eat yuanxiao (glutinous rice ball) and get all their families United in the joyful atmosphere.

Translation:

The custom of eating Yuanxiao on the fifteenth day of the first month of the Lantern Festival has a long history, and Yuanxiao is also called "glutinous rice balls" and "yuanzi". It is said that Yuanxiao symbolizes reunion, and eating Yuanxiao means family happiness and all the best in the new year.

The custom of Lantern Festival's colorful lanterns originated from Taoism's "three-yuan theory". The 15th day of the first month is Shangyuan Festival, the 15th day of July is Zhongyuan Festival, and the 15th day of October is Xiayuan Festival. The officials in charge of the upper, middle and lower three elements are heaven, earth and man respectively, and the heaven official is happy, so the lantern festival should be lit. The festivals and customs activities of the Lantern Festival are extended and expanded with the development of history.

as far as the length of the festival is concerned, it has been three days in the Tang dynasty and five days in the Song dynasty. In the Ming dynasty, the lights were lit from the eighth day until the night of the seventeenth day of the first month, which lasted for ten days. Connecting with the Spring Festival, the day is the city, which is very lively, and the lights are lit at night, which is spectacular. Especially the exquisite and colorful lights make it the climax of entertainment activities during the Spring Festival. By the Qing Dynasty, hundreds of dramas such as dragon dancing, lion dancing, roller boating, walking on stilts and yangko dancing were added, but the festival period was shortened to four to five days.