Visitors watch the traditional folk dance at China's National Center for the Performing Arts on its open day to celebrate its 12th anniversary, Dec 22, 2019. (Photos: Xinhua)

Visitors watch a Peking Opera performance at China's National Center for the Performing Arts on its open day to celebrate its 12th anniversary, Dec 22, 2019.

Visitors watch a performance at China's National Center for the Performing Arts on its open day to celebrate its 12th anniversary, Dec 22, 2019.

Visitors watch a performance at China's National Center for the Performing Arts on its open day to celebrate its 12th anniversary, Dec 22, 2019.