|"Is this all real? Or has this been happening inside my head?"
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Many Dutch witches and wizards attend Beauxbatons Academy of Magic in France, presumably due to a lack of a wizarding school in their own country. Because of this, it can be assumed that Dutch wizarding children learn French as a second language during their childhood or that Beuxbatons has a Dutch sub-division as French is not a language traditionally spoken by the Dutch.
Notable residents include the Muggle J. C. M. van Riemsdijk, who wrote a book on the history of Dutch music entitled Het Stads-muziekcollegie te Utrecht (Collegium musicum ultrajectinum): Eene Bydrage tot de Geschiedenis der Toonkunst in Nederland.