Great to hear that you had a great time Stephan! The only sessions that were recorded was the customer breakout sessions and the keynotes. These recordings, along with the slides from every breakout session will be made available in a content hub on our website in about 2 weeks. Please be patient with us, there is a lot of content edit and prepare.
There is also a thread here :)
https://forum.mendix.com/link/questions/93623
I don't think (all) breakout sessions were recorded. However, in one of the breakout sessions they told me the presentation was supposed to be shared. Not sure where and when...
There were too many parallel breakout sessions anyway, therefore at least making some slide decks and /or video recordings publicly available would be nice even for people who actually attended some of the sessions (like myself)….