As Stu stated earlier in the thread, we've been brainstorming on a Phoenix convention for a couple of years. I go to 3 or 4 shows out of state yearly, and have talked with organizers for other shows on what works, and what doesn't. The pick-up and drop off service for those willing to provide games is a must. Would probably need to budget for 4 or 5 U-haul trucks for the weekend, and need an extra non-public day at the venue for set-up.
The success of a show is largely game dependent, and a minimum of 150 games would be necessary. This is where I've stalled out on this project previously. I run a 32 member league here in town, and have talked to many members about the prospect of doing a show. Trouble is, many of the pins used in the league are highly restored collector pieces that the owners would be hesitant to let the general public knock around for a weekend. Our membership owns 300+ pins, but from talking to members about it, I doubt we could reach 100 games to dedicate to a show. Some say they are willing, but if you want to get serious about this, we need to start a list of game titles committed for the event and by whom.
Personally, I would love to see this happen. I'm sure the APPL members would be willing to volunteer to help out however they are needed.