People with new Treaty claims are being urged to send submissions outlining their grievance to the Waitangi Tribunal before Monday.
The Waitangi Tribunal says people filing a new claim need only to show they are of Maori descent and to note the historical grievance suffered.
Director Darrin Sykes says applicants have the opportunity after the cut-off date to amend the information they supply.
He expects the tribunal will receive up to 300 submissions in the lead-up to the deadline at midnight Sunday.
The Crown has signed an Agreement in Principle with Gisborne iwi to settle historical Treaty of Waitangi claims.
Turanganui-a-kiwa, a collective of Gisborne iwi, has been negotiating with the Government on the claims since last year.
Their grievances centre on the war between the Crown and iwi in the 1860s, which included the execution of unarmed prisoners by Crown forces.
The Agreement in Principle signed on Friday includes financial redress of $59 million, and a cultural revitalisation plan.
It also vests nine sites of cultural signficance to the iwi, totalling 157 ha.
That includes Young Nick's Head, which is to be held and administered by the iwi as an historic reserve.