Hundreds of gathered in Edinburgh Place in Central on Sunday to rally support for a planned three-day strike by the social welfare sector.
Organisers say they expect around 2,000 social workers to join the strike - due to run from Tuesday to Thursday.
One of those planning to join the strike is Tonica Wong, a social worker.
She disagreed with suggestions that the strike would have an impact on the provision of essential services for people in need, saying they had been planning the action for some months, and had made preparations.
"As social welfare workers we are fighting for social welfare and now the situation is getting worse, so people have emotional distress about this," she said.
Wong said they had to fight for a better future. "I don't think it is unethical," she said.
Participants also wrote Christmas cards to support those detained over the pro-democracy movement. One of them was a man identifying himself as Fung.
"I feel sorry because we are enjoying the freedom we have now but they sacrificed theirs," Fung said.
Yu, a youth service activity assistant, says he's striking also because he thinks an overhaul is needed for government. He says it's important to push for democracy so that they can have accountability in government.
Last updated: 2019-12-15 HKT 16:36