I'm pretty sure no one is meeting up in Holland at the moment. There some Dutch people blogging about personal development in dutch:
P.G. Snacks: Personal growth in bitesize chunks,
Everyday Improvement,
vincentbal.nl,
Changelevation.com and probably some more people I'm forgetting. There's also a few Belgians writing about pd.
There's some more Dutchies on the boards here though, maybe they'll see this message.