How can I add a hackspace to the map?

OpenStreetMap developers have often made use of hackspaces for weekend hacking sessions and other events, but I cannot find any objects with tags including "hack" on tagwatch for Europe. I'd like to add the local hackspace and the assorted community activities (communal media workshops, dance studios, exhibition space and training rooms) hosted at the same site. The closest tag I can think of is amenity=community_centre, but somehow this doesn't seem to quite capture the concept. What do you suggest?