Well if you're ever in Munich, you have to look for anything PUMUCKL by Ellis Kaut (with Barbara von Johnson illustrations)--but this is mid-'60s and beyond and I'm not sure if there were comic books, but there was everything else (Pumuckl being a huge thing in Bavaria). My great regret is that when I was in Munich I never looked for it--so some day I have to go back there and hunt for Pumucklbuchen & Pumucklfilme (I did buy the first children's book when I was in Vienna last time). I'll have more about Pumuckl in a couple of days.
But there's lots of things to search for in Europe--I wouldn't know where to begin with all the great kinds of comics and other funny books produced in Belgium, France, Switzerland, Germany, and yes in Eastern Europe. When I was in Serbia, I saw that they were having a comic book convention in Belgrad--I believe the date was something like July 7th, 2012--but my friend and I were heading into the countryside and then back to Austria, so I couldn't manage it.