I also am looking forward to the July event. It will be my second, and can say that I have the "pinball bug". I have 2 recommendations for the show.
1) Have a live demonstration on play field restoration. Demonstrate the sanding, repainting, refinishing techniques. Maybe some beat up play fields could be donated for such an event. Might also be a good plug for someone that does it as a business.
2) Beer girls! A couple blonde german girls in Octoberfest garb with big... mugs. Would we need bouncers for this?