Use {{location|PL}} to tag expeditions that took place in Poland. It will add Category:Meetup in Poland to the expedition.
Using ISO 3166-2 abbreviations, you may also tag the województwo, and using license plate codes, you can tag even the powiat 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 powiat ostródzki is a subcategory of Category:Meetup in województwo warmińsko-mazurskie, which is a subcategory of Category:Meetup in Poland. The subcategories should be sorted in by their respective code.
Examples
{{location|PL}}: Poland{{location|PL|WN}}: województwo warmińsko-mazurskie{{location|PL|28}}: województwo warmińsko-mazurskie{{location|PL|N}}: województwo warmińsko-mazurskie{{location|PL|N|OS}}: powiat ostródzki
