Among the twenty-four solar terms, the ones that are both solar terms and traditional festivals are

Of the twenty-four solar terms, the ones that are both solar terms and festivals are Qingming and the winter solstice.

Ching Ming is a combination of a festival and a holiday. The festival is a "heavenly time", which is purely natural time, while the holiday is a "human time", which is a socio-cultural time choice. The winter solstice is both natural and humanistic connotations, both natural points of the festival, but also a traditional festival of ancestor worship.