Hong Kong police and local media reports said 37 people were attending court in Kowloon, each facing one count of taking part in a riot, a rarely used charge that carries a maximum sentence of 10 years in prison.
Defendants were given bail and their cases adjourned until April, the reports said. A 15-year-old appeared separately at a juvenile court to face the same charge, local channel Cable TV reported.
Activists were angered by authorities' attempts to crack down on food hawkers selling fishballs and other local delicacies for the Lunar New Year holiday. The unlicensed vendors are a local holiday tradition but attempts this year by authorities to remove them stoked concerns that Hong Kong's local culture is disappearing as Beijing tightens its hold on the semiautonomous Chinese city.
Protesters pelted police with bricks and glass bottles and set fires on the street. Officers responded with batons and pepper spray. One officer fired two warning shots into the air, a highly unusual act in Hong Kong, which otherwise has a reputation for being extremely safe. Nearly 90 officers and four reporters were injured.
Police said 16 other people, including one as young as 14, were released on bail as they continue to investigate. They said another 10 are being held for "for further enquiries.