Concerned Armidale citizens will join people across the nation in overnight vigils on Sunday as part of a show of support for Medevac, which the Senate may repeal next week.
Rural Australians for Refugees in Armidale and across the country will take part, including outside Parliament House in Canberra, to stress to politicians their concern about the possible repeal.
"It's a matter of injustice that people in Australia's care are not treated properly," Armidale RAR member Bar Finch said.
"It's important that legislation stays in and does not get repealed, in order to transfer medical cases to better treatment places."
Medevac allows asylum seekers and refugees on Manus Island and Nauru to be brought to Australian hospitals if two doctors think it necessary.
About 130 people have received life-saving medical treatment in this country since the bill was passed in February, but the Coalition and others on the right want to end it.
The Senate is expected to vote on Medevac next week; the House of Representatives already voted in July to repeal the laws.
Medevac, Ms Finch believes, could have saved Hamid Khazaei, a young Iranian detainee who died from a leg infection in 2018.
It came after the Department of Immigration rejected doctors' recommendations that he be treated in Australia.
Armidale RAR members will hold their candle-lit vigil from 6.30pm on Sunday to 9.30am on Monday.
Ms Finch said anyone was welcome to take part or just learn more about offshore detention.
"We welcome conversation from anybody."
Ms Finch said offshore detention was "deeply unjust".
"It's mainly because people choose not to think about it, because it is very hard to think about.
"We're basically holding hundreds of people hostage, making some stateless and keeping others trapped."