Hundred 4 Harper is a community-driven team fitness challenge held in honour of Harper and all children affected by Diffuse Intrinsic Pontine Glioma (DIPG), a rare and aggressive childhood brain cancer.

Taking place on Sunday 29 March 2026 at Reborn Athletic Hub, Caringbah, the event challenges teams to collectively complete 100km across running, cycling, rowing and the skiErg. Hundred 4 Harper brings the community together to raise vital funds and awareness for childhood brain cancer research, while offering hope to families impacted by DIPG. All funds raised and donations provided support RUN DIPG’s mission to move towards a cure.