I know this festival came from the story about Jie Zitui in the Spring and Autumn period./

这个节日起源于春秋战国时期介子推的故事。

youdao

The thought of Xia and Yi gradually came to being and became systematic in the long history course from Spring-Autumn period and the Warring-States period to Qin-Han Dynasties.

夏夷思想是从春秋、战国时期到秦统一中国的漫长的历史过程中由产生而日渐系统化的。

youdao

Then came the Spring and autumn and Warring States periods (i. e., the Eastern Zhou Dynasty), periods of transition from slave to feudal society.

之后就是春秋战国(即东周)，这一时期被认为是由奴隶社会向封建社会的过渡阶段。

youdao