Free market
On queens day it's tradition in most towns to have a so called "vrijmarkt", which literally translates to "free market". It's the one day in the year that everyone clears out their attic and tries to sell their junk to others on the street. If that sounds like a very large garage or yard sale, it is... But it's just once per year. And the government puts up signs to indicate where the vrijmarkt starts and where it ends. Hey, we're Dutch after all...