@ Wiking.... and all the others: You are wrong in your Thinking
Because it is not a event with a meeting from the Experts from all the Collectors
... you can find on these event the "Experts" only from the association "Modellbauverbandes Rhein Main Neckar e.V." and some shops (they have nothing to do with the Experts)
And if the club write "Expert", they are thinking not in classes..... the word expert should not put to weigh it (dt. nicht so auf die Goldwaage zu legen).
An Expert from the Association/Club is also be someone who is the only one who builds such kind of models in the club.
But is not everyone an expert for himself? https://www.modellbau-expertentag.de/