Australian Council of Trade Unions president, Ged Kearney, said many Australian unions were actively participating in the yes campaign.
Polling has shown youth voters are the strongest supporters of equal marriage, but just.equal says they are less likely to be enrolled to vote, and if they are enrolled their address details are more likely to be wrong.
Ahead of the deadline, the Equality Campaign has encouraged all Australians to enrol and update their details with the Australian Electoral Commission.
Below we explain everything you need to know about the same sex postal vote and how you can make sure your on the electoral roll.
In the weeks leading up to the close of rolls after the 2016 election was called on 8 May there were 132,000 additions to the electoral roll, out of a total 687,000 enrolment transactions.
While there was concern about putting civil rights to a public ballot, now that the survey is happening, celebrities like Ian Thorpe have been doing their part to get out the vote.
You must be registered before 6pm on August 24 to participate.
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Pensions regulator launches prosecution against BHS man Chappell
The scheme was eventually rescued earlier this year when TPR negotiated a settlement of up to £363m (€396.2m) with Sir Philip. Chappell's company Retail Acquisitions bought the now collapsed BHS for £1 from Philip Green's Arcadia group in March 2015.
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It didn't take long for things to turn nasty either, with some truly bad posters showing up in Melbourne recently.
When will I get to vote?
"The trusted person would then seal the form in the reply paid envelope and post it back to the ABS".
In a new video produced by Australian Marriage Equality, a national organisation working to ensure same-sex marriage is legalised, Thorpe demonstrates how enrollment can be done in less than a minute. A result would be returned by November 15.
A majority of votes in favour of same-sex marriage is not enough to legislate it.
The circulation of anonymous fliers and posters, like those seen in Melbourne and Sydney, "really shoot the nation", said Sally Rugg, the marriage equality campaign director at GetUp, an activist group.
Proponents for same-sex marriage say the vote, which is being challenged in the High Court and whose outcome is not legally binding, exposes gays and lesbians to a bruising campaign for no good reason.