Campaigners in Australia will tomorrow (12 April) urge the government to seize the 'historic opportunity' to legalize gay marriage.
During the hearing in Sydney, legal, religious and community leaders will tell a House of Representatives inquiry into marriage equality why they support or oppose the reform.
It comes after a letter signed by 54 clergy supporting marriage equality was released.
Alex Greenwich, from the Australian Marriage Equality campaign, said his message to the inquiry will be that now is the time for reform.
'The majority of Australians support this reform and an even larger majority think it is inevitable. It's time for the nation to resolve this issue once and for all,' Greenwich said.
'The current inquiry has a historic opportunity to move this issue forward by recommending a reform that will benefit families, communities and the economy, which will make Australia a more equal and inclusive nation and which has no cost to any one.'
Greenwich added that witnesses supporting reform will highlight the positive impacts on families and on mental health.
He said: 'A substantial body of research shows that when same-sex couples are allowed to marry there are broad benefits to their families and to society, especially in terms of better mental health.
'We will be doing our best to highlight these benefits at tomorrow's hearing.'
Tomorrow's hearing will be held in the Macquarie Room in the New South Wales Parliament from 10am to 5pm.
From 4pm Australian Marriage Equality, Parents and Friends of Lesbians and Gays and the NSW Gay and Lesbian Rights Lobby will appear.