Princess Margriet and her husband prof.mr. Pieter van Vollenhoven will attend - on Friday 16 November - the 37th Peter Stuyvesant Ball in New York. A day earlier, Thursday the 15th, the couple will attend a special ceremony where 800 tulip bulbs will be planted in Corlears Hook Park in Manhattan.
More here (in Dutch, but hopefully soon available on the royal website in english too ..).