Thousands of same-sex marriage supporters have door-knocked around the country, encouraging Australians to post their votes.
Teams of volunteers hit the streets of Leichhardt, in Sydney's inner west, on Sunday in what the Equality Campaign says is the county's largest door-knocking event.
"This is incredibly important for people, this is about their lives and their dignity and we have a duty as a campaign to do everything in our power to win this on their behalf," Equality Campaign executive director Tiernan Brady said on Sunday.
In the past 15 years, support for same-sex marriage has more than doubled from 30 per cent to 65 per cent, he said.
"That's because people talk to their family, talk to their work colleagues and talk to their community about their lives," he said.
When asked about the controversial text message campaign urging people to vote 'yes', Mr Brady said "We can't leave any stone unturned in our quest to deliver equality to people."
"There are 16 million people out there with a vote and we have a duty to use every mechanism in our power to talk to every one of them about why marriage equality matters, about why it's so important to post your vote and why marriage will take nothing from anybody but will make Australia a fairer place for all," he said.
Excited first time door-knockers Matt Dempsey, 23, Kate Littrich, 23, and Kurt Hughes, 21, were expecting a positive response from Leichhardt locals.
"We're all pretty active on social media and we've seen some negative stuff thrown around there but I think it's very different when you're face to face with someone, they're less inclined to be so upfront," Mr Dempsey told AAP.
"When you get to people on a personal level - we're standing there in front of them - I think we'll get a different response."