What is the origin of ternary festival?

Sanyuan Festival is a general term for traditional festivals, including Shangyuan Festival, Zhongyuan Festival and Xiayuan Festival.

Sanyuan Festival originated from China's Taoist worldview. Taoism believes that the three basic elements that produce everything in the world are heaven, earth and water, which are called "three elements", and the three elements are called "officials", that is, fragments in the process of time and space flow, so Shangyuan Festival, Zhongyuan Festival and Xiayuan Festival are collectively called three elements.

Blessed by Wei Zi, the heavenly official, it was born on the 15th day of the first month, which is the so-called Shangyuan Festival, or Lantern Festival. Emperor Qing Xu, a local official, was pardoned and was born on July 15. This is the so-called Mid-Yuan Festival, also known as Ghost Festival or Orchid Festival. Shui Guan Dong Yin Di was born on October 15th, and it is called the Next Yuan Festival, which is the day when Shui Guan relieves depression and Gu Di relieves depression, commonly known as the Festival.