Ukulele enthusiasts perform during a carnival in Hangzhou, east China's Zhejiang Province, May 20, 2018. Nearly 20 ukulele performing groups gathered here to attend a carnival on Sunday. (Xinhua/Weng Xinyang)

Ukulele enthusiasts communicated with each other in Hangzhou, east China's Zhejiang Province, May 20, 2018. Nearly 20 ukulele performing groups gathered here to attend a carnival on Sunday. (Xinhua/Weng Xinyang)

Ukulele enthusiasts perform during a carnival in Hangzhou, east China's Zhejiang Province, May 20, 2018. Nearly 20 ukulele performing groups gathered here to attend a carnival on Sunday. (Xinhua/Weng Xinyang)

Photo taken on May 20, 2018 shows a scene of Ukulele carnival in Hangzhou, east China's Zhejiang Province. Nearly 20 ukulele performing groups gathered here to attend a carnival on Sunday. (Xinhua/Weng Xinyang)