The Structured Data team needs a list of properties to include for the first release of structured data.
There is an ongoing workshop onwiki: https://commons.wikimedia.org/wiki/Commons:Structured_data/Get_involved/Feedback_requests/Properties_for_Commons
I'd like to gather a bunch of people together who are familiar with Commons and Wikidata and work on taking what is in the wiki page and what we can think of into the needed list.
We did a similar workshop at the Barcelona Hackathon and it was very helpful to everyone to be able to write and draw out ideas on paper.