Entice, I'd say you could take them to video game conventions, since the 40k universe is used so widely in a heap of games like Dawn of War. That way you could take them to normal video game conventions and games workshop style events
Atleast that's what I hope to do with mine.
I've stopped playing GW games, but still love the art and I'd prefer to go to an anime/videogames convention rather than games day style events. Oh and I guess they count in comic books, since there are a few 40k ones :P but that may be stretching it. The 40k universe is in so many mediums, you could take it anywhere really.