Your guess seems a very good one to me. Too bad that the Prince of Orange, Princess Máxima (both in Brazil) and Professor Van Vollenhoven (felt ill) were not able to attend. It is a pity that Prince Constantijn and Princess Laurentien do not attend State Banquets. I wonder why not, after all they are the "Margriet & Pieter" of the future.
Nice that there is a State Banquet again in the Royal Palace Amsterdam. Wonderful and spacious venue.