Sorry to hear you have to post pone this trip.
Where abouts does Lourens live? I lived in the Netherlands for about 2 years as a student back in 1984-6. I lived in the following areas: Amsterdam, Amstelveen, Bussum, Utrecht, Almelo and Nijmegen and visited as far north as Groningen and south to Maastricht. I used to be pretty fluent in Dutch "maar mijn Nederlanse is erg slecht geworden"
Well, I guess you have something to look forward to in Autumn...and that much more time to come up with deep and insightful questions to ask for all of us!