Criticism of Hong Kong's crackdown on protests by USA officials has escalated, although President Donald Trump has tended to dismiss the issue in his comments.
China has demanded that US diplomats based in Hong Kong stop meddling in matters involving the city after a diplomat reportedly met with pro-democracy activists.
The Commissioner's Office told USA consular officials to "make a clean break" with the Hong Kong protesters, who were "stir [ring] up trouble", according to an August 8 statement.
Activists, some dressed in the movement's signature black, sat on the floor in the airport's arrivals hall and held up signs in Chinese and English condemning police violence.
"Dear travelers", some of the flyers read in English, "Please forgive us for the "unexpected" Hong Kong".
"How are there still people willing to travel to Hong Kong?" asked one commenter on the Chinese micro-blogging site Weibo.
People have been filling the streets of Hong Kong since June 9, angry over proposed extradition legislation that could have seen suspects sent to mainland China, where protesters say they could face torture and unfair politicized trials.
Underlying the movement is a push for full democracy in the city, whose leader is chosen by a committee dominated by a pro-Beijing establishment rather than by direct elections.
Lam has shown no sign of backing down beyond agreeing to suspend the extradition bill, while Beijing has issued increasingly shrill condemnations but has left it to the city's semi-autonomous government to deal with the situation. "We are not rioters, we are a group of Hong Kong people fighting for human rights and freedom".
Demonstrators promoted it on social media with a mock boarding pass reading "HK to freedom" and "warm pick-up to guests to HK".
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At the press conference, Mrs Lam said her administration will not make concessions just to appease demonstrators.
Speaking after the meeting, several attendees said Zhang cited speeches by former Chinese paramount leader Deng Xiaoping in 1984 and 1987 in which he said if "turmoil" occurs in Hong Kong, "the central government must intervene".
"Our democracy is not absolute, we have to fight for it".
Hongkongers have seen Beijing's influence grow in recent years, as activists have been jailed and pro-democracy lawmakers disqualified from running or holding office.
The gatherings, expected to run over three days, have not been authorised, but the last demonstration at the airport passed off peacefully without causing flight disruptions.
Global Affairs Canada had previously advised visitors and Canadians living in Hong Kong to take "normal security precautions", but on Thursday said it is recommending travellers "exercise a high degree of caution when traveling to Hong Kong due to ongoing large-scale demonstrations and potential violence".
They have announced a series of marches and protests across the city over the weekend as they work to keep momentum alive and demonstrate continued support for their goals.
Hong Kong's Airport Authority said Thursday it was aware of the planned rallies but that "the airport will operate normally".
In an amusing effort to scorn police claims, protesters cleared store shelves of laser pointers, flickering green, purple and red lasers the city's dome-shaped Space Museum.
The measure would require USA authorities to assess annually whether Hong Kong is sufficiently autonomous from mainland China to receive special treatment from the United States.