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Third weekend of August each year. A free open-air classical music concert is held every year on a stage in the middle of the Prinsengracht. If you have a little boat, join the crowds and make sure to bring a bottle of rose wine or prosecco for full enjoyment. It takes place during the Grachtenfestival, a 10 days classical music festival with about 150 concerts throughout the city, but is organized independently from it.