What are the traditional festivals that need to sweep graves in China?

Qingming: Qingming, one of the 24 solar terms in the lunar calendar. The traditional Tomb-Sweeping Day in China began in the Zhou Dynasty and has a history of more than 2,500 years. "Almanac": "On the fifteenth day after the vernal equinox, the bucket refers to Ding, which is used for Qingming, when everything is clean and bright, and when it is covered, everything is clean and bright, hence the name." As soon as Qingming comes, the temperature rises, which is a good time for spring ploughing and sowing, so there is a saying that "before and after Qingming, we plant melons and beans". Tomb-Sweeping Day is a festival for ancestor worship, mainly for grave-sweeping, which is a concrete embodiment of being cautious in pursuing the future and caring for the family. Tomb-Sweeping Day is at the turn of mid-spring and late spring, that is, after the winter solstice 106 days. On May 20th, 2006, this folk festival was approved by the State Council to be included in the first batch of national intangible cultural heritage list. In addition, there are many poems about Qingming, among which Du Mu's poem Qingming is the most famous.