Why do kindergartens in China carry out traditional festivals?

Before each festival, send a letter to each parent, introduce the festival curriculum to parents, invite parents to assist their children in the investigation and collection of relevant information, enrich their children's relevant experience, and let parents know what their children are learning in kindergarten and how to cooperate with the teacher's education and teaching. For example, take part in holiday preparation activities, let parents and children buy things together, clean up and decorate their homes with their children, thus mobilizing their initiative, enthusiasm and creativity in life.