Wait till about end of Jan and the full Dutch race calender will be available in PDF.

For an indication look at last years program at :

http://www.brandingsport.nl/NFB_wedstrijdkalender_2006v4.xls


Good choices are :

Texel Dutch open (week of bouy racing before round Texel itself)
NFB Kustzeilevenement
HvH Scheveningen (distance race with lots of M20's)

I can also warmly recommend :

NFB Westlandcup in weekend 29/30 july

Wouter