A thought that has occurred to me over the years is that you may only need one camping pass. If you park the second car in the marked bays on the pavement past the museum, the first car can go in, unload, then exit, reload from the second car etc. Unless you have marked bays in Bleu.
In the past, friends have phoned as they've arrived, and we put the kit in the boot and drive in. We usually keep a couple of places for people who never arrive. All part of the tradition really.