Matthias S. if I understood correctly, you are the one who is sending the invites? I believe I did add my email to the doodle. If not, I'll PM it to you. Can you confirm if you have it or not?
It is always great to be able to understand the relational database world and be able to talk to data engineers what becomes easier in graph dbs etc. Most engineers think in relational databases so a graph db capability is at first incomprehensible to them
I think it is good to offer people options. For example, in my team, some domain experts are interested in deepening their skills in OntoClean, others in SHACL, the variety is what will make the team also stronger
