Among the 24 solar terms, what is both a solar term and a traditional festival?

Among the 24 solar terms, Qingming and Solstice are both solar terms and festivals.

Qingming is a combination of solar terms and festivals. Solar terms are "days" and pure natural time, festivals are "people's time" and social and cultural time choices. The solstice in winter has both natural and humanistic connotations. It is not only a natural solar term, but also a traditional festival to worship ancestors.