Actors perform a group dance at the Gannan Grand Theatre in Hezuo City of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, July 29, 2019. (Xinhua/Fan Peishen)

Actors perform at the Gannan Grand Theatre in Hezuo City of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, July 29, 2019. (Xinhua/Fan Peishen)

Actors perform a song and dance at the Gannan Grand Theatre in Hezuo City of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, July 29, 2019. (Xinhua/Fan Peishen)

Actors perform a folk song and dance at the Gannan Grand Theatre in Hezuo City of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, July 29, 2019. (Xinhua/Fan Peishen)

Actors perform a group dance at the Gannan Grand Theatre in Hezuo City of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, July 29, 2019. (Xinhua/Fan Peishen)

Actors perform at the Gannan Grand Theatre in Hezuo City of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, July 29, 2019. (Xinhua/Fan Peishen)