Use {{location|NL}} to tag expeditions that took place in the Netherlands. It will add Category:Meetup in the Netherlands to the expedition.
Using ISO 3166-2 abbreviations, you may also tag the province that the expedition took place in. Areas in the Dutch Caribbean have their own ISO codes, for example use {{location|AW}} for Aruba.
If the category link appears red, do not worry and create the category. Make sure that it is included in the appropriate parent category, for instance, Category:Meetup in Flevoland is a subcategory of Category:Meetup in the Netherlands. The subcategories should be sorted in by their respective code.
Examples
{{location|NL}}: the Netherlands{{location|NL|FL}}: Flevoland
