Which would fall under private, non-commercial. As Threshold pointed out, 4 Dimensions is public, not private. What you're doing is the same as screening a Star Wars movie for the public, but just not charging them for entry, which is patently a violation of Lucas's IP rights to his movies.
But hey, don't let that stop you from slamming Medievia for supposedly doing exactly the same thing (I say supposedly because they don't actually openly advertise that they're doing it, unlike you.)
--matt
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