I obviously haven't because shes overseas, but that is a very good point! They could have sub forums by state and country too! I have been a few in Melbourne (Australia) and had sessions with numerous mistresses and so I could contribute What does everyone else think?
Would each thread be by dungeon or mistress, as dungeons have multiple mistresses. Perhaps I am thinking dungeon, and then within that thread you could discuss all the mistresses for that particular dungeon. If it is a private mistress the thread could be titled - mistress xxxx (private mistress).
This is a great idea!