Here is a video news report regarding Their Imperial Highnesses Crown Prince Naruhito and Crown Princess Masako of Japan. Apparently, Their Imperial Highnesses were invited to the upcoming inauguration/investiture of His Royal Highness Prince Willem-Alexander of Oranje on April 30, 2013 in the Netherlands.
Unfortunately, a decision has yet to be made. Nevertheless, I do believe Crown Prince Naruhito will attend though Crown Princess Masako will not. The Imperial Household Agency (IHA) will no doubt claim that she is still to ill to travel outside of the palace or her room for that matter. Poor woman.
royalcorrespondent.com 
Ah that’s so sad! I wish she would get the chance to leave Japan for a couple days. To me it’s the Japanese royal house that makes her sick. Such a intelligent woman is wasted in a royal house where women are still required to hold still and keep their mouth shut.