Thanks for the book recommendations, will definitely check those out.
It's been a few years since I went to Historicon, but the last year I was there some of the guys re-created the Charge of the Light Brigade in 28mm...I think the table was 6 feet wide and about 30 feet long, or something like that, so I would think you'd probably be able to get the space you need for the game (might be a little late for this year though, as the con is in July). I don't know the Historicon organizers, but Ruckdog is right, that convention would be probably the best venue for that game in the U.S. (since it is primarily a historical wargaming convention).