Why do you play lanterns on the fifteenth day of the first month?

There are many theories about the origin of playing lanterns. A widely circulated saying is that the custom of playing lanterns on the Lantern Festival began in the Eastern Han Dynasty. Emperor Liu Zhuang of the Eastern Han Dynasty advocated Buddhism. He heard that on the fifteenth day of the first month, a Buddhist monk watched the Buddhist relics and lit lanterns to worship the Buddha, so all the gentry and ordinary people hung lanterns that night. Later, this Buddhist ceremonial festival gradually formed a grand folk festival. This festival has experienced the development process from the court to the people, and from the Central Plains to the whole country. During the Kaiyuan period of the Tang Dynasty, in order to celebrate the country's prosperity and people's peace, people tied lanterns, symbolizing "lucky dragons, rich people and strong country" with flashing lights. Since then, the custom of playing lanterns has been widely spread. There is another interesting folk saying about the origin of playing lanterns. Legend has it that a long time ago, a god bird got lost and landed on the earth, but was shot by an unsuspecting hunter. When the Emperor of Heaven found out, he was very angry. He ordered the heavenly soldiers to set fire to the ground on the fifteenth day of the first month, burning all the property of people and animals. The daughter of the Emperor of Heaven was kind-hearted, and could not bear to see the innocent suffering of the people, so she secretly came to the world and told the people the news. A wise man came up with an idea. He asked everyone to decorate their homes, set off firecrackers and set off fireworks on the 14th, 15th and 16th of the first month, so that the Emperor of Heaven would think that it was the heavenly soldiers who set the fire. On the night of the fifteenth day of the first month, the emperor looked down and found that for three consecutive nights, the world was red and the noise was deafening, thinking it was the flame of fire.