Hong Kong democracy activist Joshua Wong was sentenced on Thursday to a further 10 months in jail.
Wong is guilty of taking part in an unauthorised vigil last year commemorating the 1989 Tiananmen Square crackdown.
The annual event on June 4 was cancelled for the first time in Hong Kong in 2020 with police citing the global health crisis.
Still, tens of thousands of people lit candles across the city in what was largely a peaceful event.
Judge Stanley Chan also sentenced Lester Shum, Jannelle Leung and Tiffany Yuen to between four and six months.
A handful of activists gathered outside the court to protest the case.
Chow Hang Tung is from the Hong Kong Alliance in support of Patriotic Democratic Movements of China:
"This is a charge for an unauthorised assembly, for a totally peaceful assembly confined to Victoria Park. "
Wong is already serving time for other illegal assembly convictions relating to the 2019 protests.
He also faces charges under the city's sweeping national security law which was brought in last year.
The legislation punishes anything China sees as subversion, secession, terrorism or collusion with foreign forces with up to life in prison.