A huge Thangka is prepared for exhibition to celebrate the Shoton Festival at Drepung Monastery in Lhasa, Southwest China's Tibet Autonomous Region, Aug. 21, 2017. The festival, also known as the Yogurt Banquet Festival, is a week-long gala held since the 11th century. The modern festival includes Tibetan opera performances, forums, painting and photography shows that also promote tourism. (Photo: China News Service/He Penglei)