On Friday night protesters formed human chains citywide, with everyone covering their faces in some way in defiance of the mask ban.
The peaceful event comes ahead of a mass rally organizers are planning Sunday to press their demands.
Hong Kong protest organisers say they intend to stage a march through Kowloon on Sunday despite losing an appeal against a police ban on the procession.
More than 90 per cent of a 3,200-strong alumni at Hong Kong University on Saturday passed a motion calling for Lam's resignation, saying students had suffered "injuries from police brutality" while in custody.
Apple CEO Tim Cook met the head of China's market regulator in Beijing on Thursday, the Chinese agency stated a week after the USA government was pushed into the midst of political spats between the mainland and protesters in Hong Kong.
Hong Kong now has extradition agreements with 20 jurisdictions across the world, including Australia, however Chan could not be extradited to Taiwan to face the murder charges because the two governments do not share such an agreement.
Lam again rejected calls for an independent inquiry into police brutality, the latest coming from Rocky Tuan, the vice-chancellor of Chinese University.
Protesters takes selfies while wearing masks during a protest in Hong Kong, Friday, Oct. 18, 2019.
China denies the accusation, blaming foreign nations such as the United States and Britain for inciting the unrest. People masqueraded as Disney characters, animals and super heroes, but the most popular mask was one of China President Xi Jinping.
Chan Tong-kai, 20, is wanted in Taiwan for the murder of his pregnant girlfriend during a holiday the two Hong Kongers took there in February previous year.
He was however jailed in Hong Kong on money laundering charges and is due to be released this week. But the proposals sparked massive protests, generated by fears the extradition amendments would put residents at risk of being sent into mainland China's Communist Party-controlled judicial system. Lam formally withdrew the original bill in September.
Hong Kong hub is facing its first recession as a result of the unrest, which has damaged tourism and retail.
"We urge the United States to stick to worldwide law and the basic norms governing global relations, earnestly respect China's sovereignty and stop interfering in Hong Kong affairs by any means", said Zang.