The people of the Netherlands are normally quite introvert, which is illustrated by the local saying: ‘act normally, then you will act already crazy enough’, but one day each year, everybody goes crazy: Queensday, the 30th of April.
Officially to commemorate the b-day of the former Queen (the current Queen Beatrix has her b-day on 31st January, not a real good date for a party as it is mid winter and cold here), it is now known worldwide for all things happening:
Amsterdam doubles its population size for a day, and the entire country is coloured Red, White and Blue, but especially: Orange, the national colour. People who normally do not want to caught dead with nationalist symbols are fully dressed in Orange, dancing all day long on boats that cruise the beautiful canals of Amsterdam. The entire country is one big flee market as everybody is allowed to sell all their junk and valuables on the street. Children try to make a euro by playing musical instruments, major artists perform on giant stages, and on every corner hundreds of orange people are dancing the day and night away to the sound of impromptu DJ’s, whether influenced by plenty of Heinekens or not :-)
If you have only one day to spare in the Netherlands, make it 30th April. See you next year!