What did the ancients do with popcorn?

The legend of the dragon head festival and popcorn. The dragon head festival originated from the times. Fuxi "attaches importance to agriculture, mulberry and ploughing", and on the second day of February every year, "the royal mother delivers meals and the royal driver plows the fields". Later, the Yellow Emperor, Tang Yao, Yu Shun and Yu Xia all followed Fuxi's example.

When I arrive in Zhou Wuwang, every year on the second day of February, a grand ceremony will be held to call on all civil and military officials to work together.