Google Kubeflow team organised a Kubeflow doc sprint in July 2019. A doc sprint is like a hackathon for docs. Over the course of three days, participants developed tutorials and fixed documentation bugs.
I participated on Day 2 and helped document an overview topic on using Jupyter notebooks in Kubeflow.
Github PR: https://github.com/kubeflow/website/pull/914
Project link: https://github.com/kubeflow/website/wiki/Kubeflow-Doc-Sprint