Ngārimu is a member and former chairperson of Te Roopu Raranga Whatu o Aotearoa, having been invited onto the committee of Aotearoa Moananui A Kiwa in 1988. She is heavily involved in supporting and organising Kapa haka performances and events. She is a member of the Waitaha Cultural Council Trust and helped organise the Te Matatini Festival at Hagley Park in 2015. Ngārimu also works to support the use of te reo Māori, volunteering as a teacher of Te Ataarangi and uses as a learning tool cuisenaire rods. She has also been a judge at several Te Matatini competitions.
