Having Pinburgh coupled with a show would be tough on the players. You are pretty much playing pinball the entire time during Pinburgh and wouldn't have time to do anything at the show. Plus people who don't get in the field of 400 for Pinburgh might not be as motivated to come just for the show.
But PAPA coupled with a show would be great because there is no limit to how many people can enter PAPA plus you can enter the tournament at your leisure. So you could easily go back and forth between the show and PAPA.
Of course this is just all wishful thinking but having the two combined would be great because then you would have people come who want to play and people who want to buy stuff. I know a lot of people who don't come to PAPA or Pinburgh because there is nothing for sale or vendors selling parts like the other shows.