Nice to see the older Van Vollenhoven grandchildren again. I am sure the Amsterdam-based part of the family will be checking their phones non-stop during the party to check the football match of Ajax.
A pity that princess Christina could not make it, I hope her illness is not the reason.
It seems that the Duchess of Parma was the only niece (in-law) who was able to attend. The King and Queen are on vacation in Greece at the moment as the school holiday is still going on. On Friday the Royal Airforce -with approval of the king and the minister of Defence - promoted Pieter to a a titular Commodore.
According to the press the Orange-family has a 'big surprise' in store for Pieter during the party, but as it goes with surprises they keep a secret.