Wikimedia Finland will organise a tagging event for Saami images on Commons see https://www.facebook.com/events/1442934085831540/. The focus will be on describing images already in Commons.
We would be interested to know the scope of imagery from various sources and set up ways to keep up with the data, a dashboard for example, or links to categories to begin with. The initial lists could be added on the projects's wiki page (which will be translated to other languages soonish). https://fi.wikipedia.org/wiki/Wikiprojekti:Saamen_kielet_ja_kulttuuri