This morning I am at the FIRST robotics challenge kickoff for 2020 (my son is on the team again this year), and have been updating this lovely Plone 5.2 / Python 3 site https://waverobotics.com/ that is running on an Ubuntu 18.04 LTS Linode.
It was a lot of fun to get this site going over the last few months, and it has been SUCH an improvement over the proprietary software service the team had been running. In addition to being modern, with a responsive theme, Plone lets the many team mentors and students contribute content while still preventing "oops" moments, through the use of Plone's powerful permissions, folder sharing, and group roles.