The conference, from October 7 to 9, will be based at Hotel Armitage and has involved a lot of work by some of the 50 families belonging to the Tauranga club. A major fundraiser will be a garage sale this Sunday at the Queen Elizabeth Youth Centre from 10am to noon.
Mrs Irwin said having twins and triplets was the same fundamentals as having one baby, but with different dynamics.
A large proportion of the current members had identical twins and there were four sets of triplets in the group.
The group provided support for multiple birth parents and held a playgroup each Tuesday at Welcome Bay.
Mrs Irwin said hosting the conference was a big achievement and the five-strong committee had worked "above and beyond" to make it happen.
The Tauranga group mainly attracted people from pre-birth through early childhood until the children reached school age.