A herdsman performs collecting hada, a piece of silk used as greeting gift, on horse during a Nadam fair, which kicks off on Aug. 18, 2018, in Hejing County, northwest China's Xinjiang Uygur Autonomous Region. Nadam, meaning "entertainment" or "recreation" in Mongolian, is a folk festival of the Mongolian ethnic group. (Xinhua/Hu Huhu)