Residents attend a dumpling making contest to celebrate winter solstice in Zhangjiakou, north China's Hebei Province, Dec. 21, 2016. The 2016 winter solstice falls on Wednesday. Chinese people regard the winter solstice, which marks the beginning of the coldest period, as a golden opportunity for family reunions and a big meal. Dumplings and tangyuan, small dumpling balls made of glutinous rice flour and sweet fillings, are must-have traditional food on the day in respective north and south China. (Xinhua/Chen Xiaodong)