I had it for years, our national lottery hands them out when you buy the special Queens Day lottery ticket. If only I would win.... Anyway below the explanation of Queen's Day and even more importantly Queen's Night which is basically one HUGE street party with lots of music and drink.  I actually might skip it this year (been there, done that and got the t-shirts) and go for Queen's Day which I've never really done since I was way too busy sleeping off the massive hang-over of the previous night ;-).

Queen's Day (Dutch: Koninginnedag) is a celebration in the Netherlands, the Netherlands Antilles, and Aruba on April 30 (or April 29th if the 30th is a Sunday^[1]). Originally a celebration of the queen's birthday, it is now mainly known for the 'vrijmarkt' (literally 'freemarket'), the one day in the year that anyone is allowed to sell anything in the streets and 'koninginnenacht' (Queen's Night) on the preceding night. It is also a Dutch holiday.

It started as a celebration of the birthday of Queen Wilhelmina (1880-1962), on August 31. After 1948 Koninginnedag moved to April 30 (the birthday of Queen Juliana). When Queen Beatrix succeeded Juliana on jan 30, 1980, she decided to keep the holiday on April 30th as a tribute to her mother. Furthermore, the weather on her own birthday (January 31st) tends to prohibit the traditional outdoor festivities. April 30th, however, is renowned for having very pleasant weather.

During the reign of Queen Juliana, and the Queen would welcome people who came to the Soestdijk Palace. The Queen and her family would stand on a dais, and a long line of citizens would walk past, congratulating her and presenting her gifts. These days, Queen Beatrix visits one or two towns where she is shown traditional Dutch dances and demonstrations of old crafts.

This is a typical occasion for oranjegekte (orange craze), when the colour orange is a ubiquitous sight, referring to the name of the Dutch royal family, the House of Orange. There are orange banners, orange colored foods and drinks, and extreme amounts of orange clothing and creative accessories are worn as well. Sometimes even the water in fountains is dyed orange. It is not uncommon for people to impersonate the queen, not always in a flattering manner.