It's likely to be held at 8PM and will be live on Parliament TV, Sky channel
94 or Freeview channel 22 â€“ or can be streamed here. S&M's on Cuba St in Wellington will also screen the debate live. GayNZ.com will carry live reports on the debate and will have gay community and political reaction when the vote is taken.
There was a chance debate on the second reading would be delayed, however with National deciding not to use its financial veto on the Mondayisation bill, lengthy debate on that topic should be avoided, and the second reading of the marriage equality Bill should go ahead tonight.
Louisa Wall and the Campaign for Marriage Equality are confident it will have the numbers to pass. It would then require a successful third reading to be passed into law.
The first reading passed 80 votes to 40.
The New Zealand Herald has been running a straw poll of MPs throughout the process and says just one MP, National MP for Rangitikei Ian McKelvie, has decided not to back the Bill after supporting it through the first reading.
Several more MPs said they were consulting their electorates until the last minute.
GayNZ.com will have full live and rolling coverage tonight.