There used to be a booking form and everything on the bigbadbass.com site (the official valave site) but this just re-directs to www.thegrandeunion.com which just has the Valve logo and says coming soon... So don't really know what's going on with this at the moment...
Best course of action might be to look at the back of a recent valve release - there should be an info@ address to write to for more info
Good luck, and if you get through on this I want guest list!
Yeah the grand Union link was the one matey....think this may be a little ambitious though bro, gonna cost fookin wedge and a half and you'd need a proper venue to have them down....good luck, I'll come along if you pull it off..lol