The Max Ernst Museum in Germany is to host a major retrospective of the art of Moebius. Opening 15th September and running until February 2020, with reasonably-priced tickets. The show will feature 450 works covering his whole range, plus a full catalogue.
The museum is about four miles south of the outskirts of the German city of Cologne. Cologne is about 120 miles east of Calais, or about 100 miles SE of Amsterdam, and is well connected by rail.
For a total comics-arts-o-rama visit, note that it usefully overlaps at the end of January with the huge Angouleme 2020 in France (opens 30th January 2020).