Students from Favona Primary, where Lomu attended school as a child in Mangere, are paying a special tribute to Jonah at the memorial service being held at Eden Park.
LIVE: Jonah Lomu Eden Park memorial service
There were 18 year five and six pupils chosen to do a performance in front of the crowd.
They started preparing four days ago after an ex-pupil, Matthew Salapu, suggested the idea to deputy principal Heather Harvey.
Ms Harvey said the students are "very" excited.