Local people perform grass-dragon dance during the Sama Festival in Sanbao Dong Village in Rongjiang County, southwest China's Guizhou Province, Dec. 18, 2018. Sama was the name of a heroine in ancient maternal society of Dong people. The Sama Festival, enlisted as one of the national intangible cultural heritages in 2006, is held to commemorate their ancestor. (Xinhua/Yang Chengli)