AMSTERDAM, NETHERLANDS - APRIL 28: King Willem-Alexander and Queen Maxima of The Netherlands host a dinner for 150 Dutch people to celebrate his 50th birthday in the Royal Palace on April 28, 2017 in Amsterdam, Netherlands. After the dinner the King and the Queen will open the Royal Palace for 50 hours with an exhibition that gives an overview of the Netherlands in the last 50 years. (Photo by Patrick van Katwijk/Getty Images)