If you build it, they will come.
I'm still of the opinion that the main reason not so many people came to the party is because it was so hard to find. Christ, I came to the previous one, knew where I was going this time, and still got my friends bloody lost on the way!
http://mypict.me/show.php?id=tveE
Either more signage around the main event saying that the party is on and where it is, or have it in a more easily accessible location like a pub in Xscape would go a long way. A mention at the end of each talk, that sort of thing. That obviously requires the SM blessing - I suspect that without that, all we'll get is a handful of forumers and a hefty loss.