I don't really know how eventlibre.org works, but I'll reach out now that I have ack from UbuntuOnAir, ubuntu-fr says they use profits for events I believe the ubuntu-fr group runs eventlibre, but that's just a hunch https://mamot.fr/@ubuntufrorg https://www.youtube.com/watch?v=T1YbGX4liww&t=322s