Hi Peter,
in Germany most of the modeling shows are military or aircraft dominated. THere are only a few car or truck modelers at these shows. We have 22 big cmodel car shows in Germany The Little Wheelies in Hannover or the The Frankfurt Model Car Show. Unfortunately the Hannover show will not take place this year but, Erich show in Frankfurt will be at the first weekend in October. There are a also few guys from Switzerland at this show.
Another show is the Model Car Exhibition at the German Street Rod Association Nats in Weilburg (close to Frankfurt) on July 13/14, 2013. Because the real cars are mostly Rods and Customs the model car show has the same theme. I organize this show the first time this year. I'll keep you informed.
One other excellent show (truck and car models) Europe is the On the Road Show in Jabeeke/Belgium. In my opinin the best show in Europe. Lots of people from France, Switzerland, Finland, UK, Germany, Sweden, Denmark, Poland did I miss some other countries? This show is on Mar. 16/17, 2013
If your are interested in truck modeling you have to go to Gaydon/UK