What traditional festivals in China should wear masks?

Like the south. For example, Yichun, Wanzai and Pingxiang areas in Jiangxi Province. There is an ancient festival of wearing masks. The local name is: Nuo dance. For example, there is a description in the novel Border Town. You can go and have a look.

Basically, only Nuo dancers wear masks. Nuo dance is also called "big Nuo" and "dancing Nuo", commonly known as "ghost play" or "grimacing". It originates from the totem belief in ancient clan society and is the gene of primitive cultural belief. This is a kind of folk dance, which has the functions of exorcising ghosts, curing diseases and offering sacrifices. It is a part of Nuo dance and is usually performed from the first day of the Lunar New Year to the first day of the first month 16. At first, it was an ancient primitive dance of sacrifice. The dancers wore ferocious masks and dressed up as the legendary "Fang Shixiang". While dancing, they shouted "promise, promise ..." and ran to every corner, skipping and searching for ominous things, in order to drive away the epidemic ghosts and pray for peace for a year. The existing Nuo dances are mainly distributed in Jiangxi, Anhui, Guizhou, Guangxi, Shandong, Henan, Shaanxi, Hubei, Fujian, Yunnan, Guangdong and other places, with local names such as "Nuo Dance", "Ghost Dance" and "Daxi". This kind of folk dance with a long history is generally performed in two forms: one is performed by four protagonists, and the performers wear masks such as crowns, skins and aegis, making a "Nuo" sound. The other is composed of 12 people, each with a painted hair and a few feet of hemp whip in his hand, shaking and shouting the name of the god who specializes in eating evil spirits and beasts, accompanied by music.