Labour Day is celebrated on various different days in the different states and territories of Australia and sometimes called Eight-Hour Day as the day commemorates the granting of an eight-hour working day for Australians. It is also the day where we recognise worker's rights and the contribution workers make to the nation's economy.
Considering that over 100 years of work place relations was just condensed into two sentences, if you'd like to read more about the topic the following books are a good starting place:
A divided working class: Ethnic segmentation and industrial conflict in Australia by Constance Lever-Tracy and Michael Quinlan
Revolutionary industrial unionism: The Industrial Workers of the World in Australia by Verity Burgmann.