@gabriel It's a real shame the "event hosts" use proprietary software to host and appear to be require running proprietary JavaScript just to look at the events;
https://digitalfreedoms.org/cache/com_templates/templates/wt_kempt_pro/c4ebdbf82aa98210a5aa6a83fdac7f6e.js
https://digitalfreedoms.org/media/vendor/bootstrap/js/popover.min.js?5.3.2
https://digitalfreedoms.org/media/vendor/bootstrap/js/dropdown.min.js?5.3.2
https://digitalfreedoms.org/media/vendor/bootstrap/js/scrollspy.min.js?5.3.2
https://digitalfreedoms.org/media/vendor/bootstrap/js/alert.min.js?5.3.2
(this could be free software, but I don't see any sources).

They also link straight to facebook, google "meet" for the main meeting (instead of the far superior free software Galène - with "fosstdon.org" being secondary


To be honest, every day in software freedom day on fully free systems running the Church of Emacs, so it doesn't need a day of its own and one should probably avoid being lead astray by proprietary software pushers.