Volunteers stage a performance at the Shaanxi History Museum in Xi'an, capital of northwest China's Shaanxi Province, May 17, 2018. Friday marks the International Museum Day. (Xinhua/Li Yibo)

People enjoy performance at the Shaanxi History Museum in Xi'an, capital of northwest China's Shaanxi Province, May 17, 2018. Friday marks the International Museum Day. (Xinhua/Li Yibo)

Students from Xi'an Conservatory of Music stage a performance at the Shaanxi History Museum in Xi'an, capital of northwest China's Shaanxi Province, May 17, 2018. Friday marks the International Museum Day. (Xinhua/Li Yibo)

People take part in a party at the Shaanxi History Museum in Xi'an, capital of northwest China's Shaanxi Province, May 17, 2018. Friday marks the International Museum Day. (Xinhua/Li Yibo)

A woman visits the Shaanxi History Museum in Xi'an, capital of northwest China's Shaanxi Province, May 17, 2018. Friday marks the International Museum Day. (Xinhua/Li Yibo)