The authority was last month officially recognised by the Government to negotiate a settlement of Crown breaches of Te Tiriti o Waitangi and Ngapuhi grievances.
The information hui will be held throughout Te Tai Tokerau (Northland) and New Zealand generally, and also in Sydney and Perth.
Leaders will brief tribal members on what the mandate means, the IMA election process and the next steps for the Ngapuhi settlement.
But Ngapuhi are divided over the mandate, with another faction within the 125,000-strong tribe arguing against it.
Te Kotahitanga o Nga Hapu o Ngapuhi - which wants the Waitangi Tribunal to complete its current hearing of about 360 Ngapuhi Treaty claims before negotiating settlement - is considering a challenge to the legal status of Tuhoronuku.
Spokesman Patu Hohepa said during last year's public submissions over who should hold the mandate to negotiate settlement, 63 per cent were opposed to Tuhoronuku.
He said Te Kotahitanga had a clear vision for Ngapuhi which would bring about prosperity, but it was being accused of holding up the settlement process.
"We simply want our grievances heard, and the large numbers involved in the Waitangi Tribunal process was a testament to why the Ngapuhi claimants wanted the evidence which would provide a robust foundation for any settlement negotiations," Mr Hohepa said.
"We also think that if Tuhoronuku and the Crown had got into some genuine talks over the past few years, then the Ngapuhi settlement would probably have been signed off by now," he said.
The chairman of Te Runanga a Iwi o Ngapuhi, Sonny Tau, earlier said the iwi would be seeking a bigger settlement than the $170 million that Waikato-Tainui and Ngai Tahu had each received.
He told the media on Waitangi Day that Ngapuhi wanted between $500 million and $600 million in settlement.
NZH lb