Ms Harawira said forums would be held throughout next Tuesday and Wednesday, in a marquee for agencies such as Women's Refuge and Victim Support between the campground and the marae.
"We expect to have people like Owen Glenn give a korero on why he felt it was important to establish such an inquiry, and also looking at how other agencies like police, refuge, victim support and just whanau in general can do something about it," she said.
Glenn inquiry director Ruth Herbert said inquiry members agreed to go because they wanted their work to be "led and driven from the grassroots".
"We are going to listen to what they have to say about what's working and what's not working," she said.
Sir Owen was to attend on Tuesday, but cannot get back from the US in time.
Former social worker Anton Blank, 50, who co-founded the Maori child advocacy group Ririki and will be one of the three think-tank members attending, said the forums would be "an opportunity for us to explore the dynamics of the treatment of Maori children, given that we are over-represented in child abuse statistics".
He hoped some people would tell their personal stories in one-to-one meetings with him and think-tank colleagues Kirimatao Paipa and Dr Te Kani Kingi.
Ms Paipa, an Auckland grandmother, former women's refuge worker and a survivor of domestic violence herself, said Waitangi was "a perfect opportunity to talk directly to our people and get feedback from our people".
Other Maori among the inquiry's NZ think-tank include Auckland human rights worker Marama Davidson, Maori TV journalist Carol Hirschfeld, Te Wananga o Aotearoa head Bentham Ohia, Kaitaia GP Dr Lance O'Sullivan, AUT Maori health professor Dr Denise Wilson and former Prison Fellowship director Kim Workman.