Mr. Wong, one of the most high-profile members of a movement that was quashed in 2020, was accused of conspiracy to collude with foreign forces, a national security offense.

© Lam Yik Fei for The New York Times

Mash-up videos of beloved characters from Chinese classics — some made with A.I. — have caught the attention of the authorities.

The vibrant danjiri tradition dates back three centuries, but two recent fatalities have prompted anxiety over whether participants can remain safe.

© The Yomiuri Shimbun