Which traditional festival in China is related to the first two sentences in Su Shi's Shuidiao Tou?

The first two sentences in Su Shi's "Water Tune Song Tou" are "When will there be a bright moon? "Asking for wine from heaven" is directly related to the traditional Mid-Autumn Festival in China. The prefix of this word has been written: Chen Bing Mid-Autumn Festival, happy to drink, drunk, writing this article, pregnant. It means the Mid-Autumn Festival in the year of Chen Bing. I drank happily until the next morning, got drunk, wrote this word, and missed my brother Su Zhe.

Later generations commented: "The Mid-Autumn Festival words came out of Dongpo's" Water Tune Song Tou ",and all the other words were abolished."