It was one of the worst mass murders in Australian history.
The bombing happened on March 8, 1973 at Fortitude Valley in Brisbane's CBD, when two uncapped drums of petrol were rolled into the downstairs foyer of the club in Amelia Street and were ignited.
Toxic black smoke billowed up the stairs into the nightclub where more than 100 patrons were enjoying a night out.
Fifteen people died, mostly from suffocation.
The memorial will be held at 2:00pm (AEST) on the corner of Amelia Street and St Paul's Terrace in Fortitude Valley.
Stuart died in Brisbane's Boggo Road jail in 1979.
Finch was paroled in 1988 after almost 15 years in prison and was deported to England.
Meanwhile, co-authors of a book on the 1973 tragedy have spent years investigating the case and believe they have uncovered damning evidence the convictions of both men was based on false evidence.
They are pushing for a coronial inquest into the 15 deaths to be reopened.
Mr Welling said the information warranted a new judicial inquiry or court case and has called for Queensland Attorney-General Jarrod Bleijie to investigate.
However, Mr Wellington said yesterday his role on the Parliamentary Crime and Misconduct Committee has prevented him from tabling the information in Parliament.