Prime Minister Bill English will be among several politicians to visit Ratana on Monday. Labour leader Andrew Little visits a day later, on Tuesday.
About 10,000 people are expected for the annual Ratana Church celebrations, church secretary Piriwiritua Rurawhe said.
The celebrations are a gathering of faithful to celebrate the founder's birth, but have traditionally included a political forum and a chance for politicians to woo the Maori vote.
Mr English was due to arrive between noon and 1pm and would stay for a couple of hours, spokesman Nick Venter said.
He will speak about the relationship between the Crown and Ratana.