Use {{location|MQ}} to tag expeditions that took place in Martinique. It will add Category:Meetup in Martinique to the expedition.
Using HASC:MQ abbreviations, you may also tag the parish 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 Arrondissement du Marin is a subcategory of Category:Meetup in Martinique. The subcategories should be sorted in by their respective code.
Examples
{{location|MQ}}: Martinique{{location|MQ|MA}}: Arrondissement du Marin
