We flew to Amsterdam specifically on November 6th for a reason — on this date they host the Museum Night, also known as n8 (read as "night" in Dutch). Here in Europe people don't sweat it — they named an official event slightly informally, and it's totally fine.
By the way, just in case. The English word for "Dutch" is "Dutch", and nothing else. Many people confuse it with Danish — "Danish".
Museum Night in Amsterdam isn't free, a ticket cost 13 lats. This price, however, includes all sorts of different events and installations across 50 venues, plus free transport (any kind), plus one visit to any participating museum after the night. Overall, it's a good deal if you hit up at least a couple of events on the night itself, because a separate museum trip will already run you half that amount, and transport isn't cheap either.
