At one of Sunday's rallies -- a gathering to thank US lawmakers for their support -- protesters said they were determined to keep up the pressure on local authorities after the election victory.
Renewed calls to hit the streets came after Beijing and city leader Carrie Lam refused further political concessions despite a landslide victory for pro-democracy parties in local elections.
Hardcore protesters occupied the campus nearly two weeks ago after blocking the Cross-Harbour Tunnel and set toll booths on fire during clashes with police.
The US lawmakers also approved a measure that would ban the sale of tear gas, rubber bullets and other equipment that have been used by security forces to suppress pro-democracy protests.
Activists have vowed to "squeeze the economy" as the increasingly divided city reels from one of the worst weeks of violence in the months-long crisis.
The chaos was part of largely anonymous protest movement's new strategy of "blossom everywhere", in which small groups target as many parts of the city as possible to cause maximum disruption.
A group of mainland students at CUHK attempted to depart the campus Wednesday morning over safety concerns but had to be shuttled away by boat because they were unable to leave via obstructed roads.
Efforts by Hong Kong's Beijing-controlled government to introduce tough security laws in 2003 caused major protests before being shelved.
Although the precise chain of events leading to 22-year-old Alex Chow's fall are unclear and disputed, his death is the first student fatality during five months of demonstrations.
The US House of Representatives passed the act, proposed by some congressmen, on Tuesday local time despite strong opposition from the Chinese government.
Its passage is likely to further aggravate China which has accused 'external forces' of fuelling weeks of unrest in the global financial hub.
Apple's withdrawal of the application from its App Store follows an accusation from China's state media that the app 'obviously helps rioters'.
Trump avoided expressing support for the protesters' unprecedented show of defiance against Chinese communist rule and questioned whether they were losing steam.
Thousands of protesters staged unsanctioned marches and flashmob protests at multiple locations on Saturday, a day after the city's leader outlawed face coverings at protests.
'The extreme actions of rioters created a very dark night for Hong Kong and made Hong Kong society semi-paralysed today,' said Carrie Lam.