Buddhists wearing masks attend a ceremony depicting stories of Gods and ghosts in Tibetan Buddhism at the Taer (Gumbum) Monastery in Huangzhong county of Xining, capital of Northwest China's Qinghai Province, May 31, 2015. The ceremony, which is called "Tiao Qian" in Chinese, was held on Sunday at the monastery, the birth place of Tsongkhapa, founder of the Geluk school of Tibetan Buddhism. [Photo/Chinanews.com]

Buddhists wearing masks attend a "Tiao Qian" ceremony depicting stories of Gods and ghosts in Tibetan Buddhism at the Taer Monastery on May 31, 2015. The monastery was originally built in 1379, with a history of 630 years. [Photo/Chinanews.com]

"Tiao Qian" is an important religious ceremony for the Geluk school of Tibetan Buddhism. [Photo/Chinanews.com]

A Buddhist wearing a mask attends a "Tiao Qian" ceremony depicting stories of Gods and ghosts in Tibetan Buddhism at the Taer Monastery in Huangzhong county of Xining, capital of Northwest China's Qinghai Province, May 31, 2015. [Photo/Chinanews.com]

People watch Buddhists in masks performing the "Tiao Qian" ceremony at the Taer Monastery, May 31, 2015. [Photo/Chinanews.com]

People watch Buddhists in masks performing the "Tiao Qian" ceremony at the Taer Monastery, May 31, 2015. [Photo/Chinanews.com]

Buddhists wearing masks attend the "Tiao Qian" ceremony in Tibetan Buddhism at the Taer (Gumbum) Monastery in Huangzhong county of Xining, capital of Northwest China's Qinghai Province, May 31, 2015. [Photo/Chinanews.com]

Monks attend the "Tiao Qian" ceremony in Tibetan Buddhism at the Taer Monastery in Huangzhong county of Xining, capital of Northwest China's Qinghai Province, May 31, 2015. [Photo/Chinanews.com]