Use {{location|JP}} to tag expeditions that took place in Japan. It will add Category:Meetup in Japan to the expedition.
Using ISO 3166-2 abbreviations, you may also tag the prefecture 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 Kyoto-fu is a subcategory of Category:Meetup in Japan. The subcategories should be sorted in by their respective code.
Examples
{{location|JP}}: Japan{{location|JP|10}}: Gunma-ken{{location|JP|26}}: Kyoto-fu
