A wonderful institution - the first Saturday in November when most of the city's museums open their doors at night and put on special events. The Portuguese Synagogue lit by thousands of candles, cool music in the Tropenmuseum Orangerie...
The organisers say that the aim is to attract young Amsterdammers into the museums - which is why they don't have very much information in English.
What there is about the 2007 event, you can check out here
Cultural magazine Amsterdam Weekly does the work for them.