Excuse me, what is the ancient custom of Zheng State-March 3rd?

Shangsi Festival is an ancient traditional festival in China, commonly known as March 3rd. Before the Han dynasty, it was designated as the third day of March, and later as the third day of March in the summer calendar. The third day of March in the Gregorian calendar is the last day. On this day, people scatter shepherd's purse flowers on stoves and places where they sit and sleep, thinking that they can kill ants and other pests; Hide cauliflower and tung flower in sweaters and down jackets, thinking that clothes can be eaten; Women wear cauliflower on their heads, thinking that they can avoid headaches and sleep soundly at night. Urban and rural people also climb Huishan, Hongshan, Doushan and Xishan for an outing.