A rally will be held on the steps of the state library in Melbourne to protest the Turnbull government's decision to deport a Sri Lankan family.
The Refugee Action Collective, The Home to Bilo campaign and the Tamil Refugee Council called a snap rally for 3pm on Sunday to stand in support of the family.
The aim is for people to be "as loud as we can" to prevent the family from being sent back to Sri Lanka while lawyers work on legal avenues to keep them in Australia.
Tamils Priya and Nadesalingam and their two Australian-born children lost a bid to stop their deportation at the Federal Circuit Court on Thursday, but have 21 days to appeal.
The family was issued deportation notices on Friday - less than two days into the appeal period - family friend and fellow Biloela resident Angela Fredericks said.
"The lawyers are working on getting an injunction in place so the appeal process can go ahead," she told AAP on Saturday.
It's understood the family could be deported as early as next week.
The family is being held in a Melbourne immigration detention centre.
Priya and Nadesalingam came to Australia separately by boat in 2012 and 2013 and settled in Biloela, Queensland, before having their two daughters.
Nadesalingam was getting ready for work at the local meatworks and the children were in bed when Australian Border Force officials came to the house at dawn on March 5, giving them 10 minutes to pack.
The family was taken to Perth Airport a week later and put on a plane to deport them to Sri Lanka before last-minute legal intervention saw them taken off.
A petition containing about 100,000 signatures calling for their right to stay was delivered to Home Affairs Minister Peter Dutton in May.