Hi Erick - I like Ken Cohen's suggestion. Also, you might contact the promoter, Marco Rol, before the show and ask how they run the signings. You can contact him via their website
www.csashows.com or call him at 540-456-6877. FYI, I go to all the Chantilly Shows (I live only a few miles away), but since I'm not into autographs, I've never paid any attention to how they do them.
Val