Corrections Minister Elise Archer will not attend Corrections Day functions tomorrow to recognise corrections workers due to prior commitments in Northern Tasmania.
To mark the national day, the Tasmanian Prison Service will present long service medals, national medals and director of prisons' awards.
Ms Archer paid tribute to corrections staff and said she was unable to attend functions due to "arrangements in Northern Tasmania".
Community and Public Sector Union general secretary Tom Lynch said Corrections Day was being marked at a time when "our prison service is facing massive challenges".
"The prison population is at or above the capacity of our infrastructure, there are insufficient officers to fully staff units so lock-downs roll around the prison on a daily basis. Correctional officers feel they have been let down by a Minister who deliberately misled the community about assaults on officers for political reasons," he said.
"Correctional Officers deserve to be recognized for the job they do on Corrections Day but what they really want in 2020 is an apology from Minister Archer."
Ms Archer said prison and community corrections staff worked hard each day.
'I am highly appreciative of the work undertaken by all staff within Tasmania's corrections system," she said.
"As I have said before, any assault against a staff member within our prisons is completely unacceptable - the safety of staff and prisoners is our number one priority in the Tasmanian Prison Service."
Unions and the Department of Justice will meet next Wednesday to discuss industrial issues which led to bans on some prison work.
Mr Lynch said any future industrial action depended on the outcome of the meeting.
"We're holding off any escalation of industrial action until we see what's on the table," he said.
Community Corrections acting director Tristan Bell said Corrections Day was designed to recognise the challenging work of correctional officers.
"The important and often unheralded rehabilitative work of community corrections staff is being highlighted through Corrections Day," Mr Bell said.
"TPS and community corrections staff work hard each day to rehabilitate offenders, helping them get their lives back on track so that they can become productive, law-abiding members of society who no longer pose a threat to the community."