Activist Joshua Wong said the number of participants in Sunday's march is crucial to continue informing the global community of Hong Kong's ongoing struggle.
Friction between Hong Kong residents and Beijing has been going on for over six months after proposed extradition legislation sparked the violent unrest.
Traffic through Hong Kong International Airport declined across the board past year as months of unrest, including protest-related closures at the transit hub. "But now, it is time to look at Hong Kong again", Mr Lau said. Flight movements fell 1.9 percent, while total cargo throughput declined 6.1 percent from a year ago to 4.8 million tons.
Trouble flared when police ordered the authorised gathering to disperse after officers conducting stop and searches on nearby streets had water bottles and paint thrown at them by angry crowds. The officers were not wearing riot gear and were beaten as they tried to flee, police said in a statement. "The organizer certainly is acquainted with those injured officers".
Speaking to media on Sunday night, Senior Superintendent Ng Lok-chun of the Hong Kong Island Region, said Lau was arrested for inciting the public and for breaching the terms of the letter of no objection issued for the rally because he failed to assist in maintaining order.
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Lau also called on attendees to have a new mentality in 2020, of not only attending protest events but also keep "resisting".
They chanted "we want real universal suffrage" and "disband the police force".
During the rally, police scuffled with demonstrators and handcuffed a number of people who blocked roads and set fire to barricades. They ran for cover after riot police appeared around Chater Garden and raised yellow warning flags, telling protesters that they should disperse because they were in an illegal meeting.
Police say they have used force commensurate with the levels of violence they face from hardcore protesters who routinely throw bricks and petrol bombs.
One of the organizers was also arrested for "repeatedly" obstructing officers, Ng said, without identifying the person.
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The United States has confirmed at least two cases, with both patients having returned from China with the virus. There have been no cases of human-to-human transmission outside China so far, but it could happen, he believes.
Beijing and local leader Carrie Lam have refused further concessions.
The protests, which have since broadened to include demands for universal suffrage and an independent investigation into police handling of the demonstrations had lost some of their intensity in recent weeks.
Thousands of Hong Kong protesters started arriving for an afternoon rally in the city centre after prominent activists called for continued support for the demonstrations to keep their grievances in the world spotlight.
In response to Sunday's rally, Hong Kong's government released a statement that warned against any foreign involvement.
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Previous global emergencies have been declared for the emergence of Zika virus in the Americas, the swine flu pandemic, and polio. Only travelers holding tickets for the last trains were allowed to enter, with those booked for later trains being turned away.