Use {{location|NG}} to tag expeditions that took place in Nigeria. It will add Category:Meetup in Nigeria to the expedition.
Using ISO 3166-2 abbreviations, you may also tag the state that the expedition took place in.
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 Yobe State is a subcategory of Category:Meetup in Nigeria. The subcategories should be sorted in by their respective code.
Examples
{{location|NG}}: Nigeria{{location|NG|YO}}: Yobe State
