On the 17th, Hereditary Grand Duke Guillaume and Hereditary Grand Duchess Stéphanie were in Colmar-Berg to recognize the 20th anniversary of Centre de Formation pour Conducteurs (the CFC, or Driver's Training Centre).
This is not the first visit from the Grand Ducal family, as Grand Duke Jean was there at the opening in June of 1996 and then paid a visit to see a new building in July of 2011. (Scroll down slightly to see the photos and the details.)
A little more about the event from Tageblatt. No photos at present, but they'll be added if any are made available.