Hundreds of people are expected to attend Saturday afternoon's service for the two Dunedin children killed by their father.
The death notices for Bradley and Ellen Livingstone said their lives would be remembered at a "celebration of life" service.
The service would be held at St Leonards School from 2pm and hundreds of people were expected, Gillions funeral services managing director Keith Gillions said.
The service would be held at the 180-person capacity school hall, and would be limited to family members, school pupils and their parents.
A large marquee and screen would be erected outside for those wanting to pay their respects, he said.