Other defendants include prominent barrister and former opposition lawmaker Margaret Ng and veteran activists Lee Cheuk-yan, Leung-kwok-hung, Albert Ho, and Cyd Ho.
Another former lawmaker, Au Nok-hin, 33, had previously pleaded guilty to both charges, while Leung Yiu-chung, 67, had pleaded guilty to a single charge of participating in the protest.
"We will still march on no matter what lies in the future".
The group was prosecuted for organising an unauthorised assembly on August 18, 2019 - one of the biggest in Hong Kong that year as people took to the streets calling for democracy and greater police accountability. It began as an approved rally in the city's Victoria Park but later moved to Hong Kong's Central district, in what prosecutors say was an illegal expansion of the protest.
In her ruling, Woodcock acknowledged that Hong Kong's Basic Law - a legal framework that China agreed to abide by when it took control of the former British colony in 1997 - guarantees the right to peaceful assembly, but that "restrictions are imposed, including those for preserving public safety and public order, and protecting the rights of others".
Hong Kong police have swept up numerous city's established opposition leaders among the more than 10,000 activists arrested since the protests erupted in June 2019. The maximum possible sentence is 5 years.
The US said on Wednesday that Hong Kong does not warrant preferential treatment under the Hong Kong Policy Act, a law that had allowed Washington to maintain a special relationship with the city.
The prosecution argued that the freedom of assembly isn't absolute in Hong Kong. Instead, she said the seven meant to stage an unlawful event.
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Six of the nine defendants in the case have been released on bail on the condition they do not leave Hong Kong and they hand in all their travel documents.
"In a very hard situation in Hong Kong, the political retaliation is on us", said Lee Cheuk-yan, speaking before the verdict.
Nonetheless, Martin Lee had avoided arrest until a year ago.
Thursday's verdict relates to a protest on August 18, 2019, at the height of a citywide revolt against the Chinese Communist Party's rule over Hong Kong sparked by a bill that would allow extraditions to mainland China.
Western governments, including the USA under both the Trump and Biden administrations, have condemned the arrest of the democracy leaders. The city's government separately charged some 47 prominent opposition figures with "conspiracy to commit subversion" under a national security law imposed previous year that carries sentences as long as life in prison.
"Since June 2020, elements of the [Hong Kong police] and the Hong Kong Department of Justice worked with, and under the supervision of, mainland Chinese officials to carry out politically motivated reprisals against opposition politicians and activists". These pro-democracy activists have over the years supported causes such as human rights and women's rights, and organised vigils commemorating the 1989 crackdown on student demonstrators in Tiananmen Square.
"The government has chosen 15 people very carefully out of the 1.7 million protesters, and all are moderate democratic activists and politicians", Davis said.