At 9am the iwi will prepare to welcome any visitors and also the photographs of people who have died, carried by their families.
From 10am until noon Whanganui's kura Māori and kohanga reo have time to sing and perform, and Te Taikura o Te Awa Tupua will perform as well.
After that comes the kōrero, talk of matters important to the iwi, including progress on their land claims.
"There will be space set aside to talk as an iwi," Mr Rerekura said.
The afternoon will be for entertainment by local bands, and a handful of people will stay another night at the gardens and pack everything up on the Thursday.
Funding support will come from Ngā Tāngata Tiaki o Whanganui, which has taken over the role from the Pākaitore Trust.
Anyone who wants to have a stall on the day should contact Marilyn Kairimu on 020 400 30246.