Photograph - Rockhampton Labour Day Celebration Union; 1920; Mounted photograph of the Rockhampton Labour Day Celebration Union in 1920. part of a collection relating to Australian trade unions and the Eight Hour Day. Action taken by stonemasons on 21 April 1856 led to the establishment of the Eight Hour Day; with the government agreeing that workers employed on public works should enjoy an eight hour day with no loss of pay.