A monk is seen during the butter lamps lighting event at the Jokhang Temple in Lhasa, capital of southwest China's Tibet Autonomous Region, Dec. 2, 2018. People of the Tibetan ethnic group lit butter lamps and prayed through the night in the annual Butter Lamp Festival commemorating Tsong Khapa, a master of Tibetan Buddhism. (Xinhua/Purbu Zhaxi)