Such a deal would require consultation with Maori and legislative change "subject to the usual scrutiny of Parliament", she said.
Problem Gambling Foundation spokeswoman Andree Froude said: "That won't be a free convention centre. With every new pokie machine you're going to see potentially nearly one new problem gambler."
More than 240 delegates from 14 countries at the three-day conference would discuss other forms of gambling, but the focus was on pokies, she said.
"They are the most harmful form of gambling. More than 70 per cent of people who seek help with a problem with gambling do so because of pokies," she said.
Australian gambling counsellor and former NRL player Ashley Gordon, a keynote speaker at the conference, said a freeze on pokie numbers in NSW should be replicated here.
Mr Gordon, an Aboriginal Australian, said there were obvious parallels between his people's struggle with problem gambling and that of Maori and Pacific Islanders in New Zealand.