Shortly before Willem-Alexander's installation as King of the Netherlands, the then Prince of Orange and his wife, Princess Maxima, hosted the annual meeting of the heirs to the continental thrones (and their spouses).
At this final meeting, there were two no shows as the Crown Prince of Denmark, and the Crown Princess of Norway both had previous scheduled engagements the rest of club were all present: the Duke and Duchess of Brabant, the Prince and Princess of Asturias, the Hereditary Grand Duke and Grand Duchess of Luxembourg, Crown Princess of Sweden and Prince Daniel, the Crown Prince of Norway and the Crown Princess of Denmark.
Fast forward to the present. The Duke and Duchess of Brabant are now King Philippe and Queen Mathilde, and by the end of June, the Prince and Princess of Asturias will be King Felipe VI and Queen Letizia.
One can envision the 2015 annual meeting, which are rarely publicized. In a nice quiet place, perhaps one of the Scandinavian countries, Crown Princess Victoria, Prince Daniel, the Crown Prince and Crown Princess of Norway, the Crown Prince and Crown Princess of Denmark and the Hereditary Grand Duke and Grand Duchess of Luxembourg will enjoy a nice lunch with a selection of wines and liquors, while in another room, with nannies in attendance, the Princess of Orange, the Duchess of Brabant and the Princess of Asturias will have a play date, perhaps with dolls and a tea party.