Whanganui politician, negotiator and organiser Ken Mair will marry his long-term partner, Moana Hawea, at Whangaehu Marae on January 5.
The two have seven children between them - Mr Mair four from his first marriage and Ms Hawea two from hers. They also share a daughter.
At least 400 people
would attend the celebration, he said.
Mair is a vice-president of the Maori Party and MP Te Ururoa Flavell is to be best man. Also present will be party president Pem Bird, and Ms Hawea's auntie, Maori Party co-leader Tariana Turia.
They will be joined by kuia and kaumatua from Ngati Apa and Whanganui, and many others.