A meetup group I belong to recently combined destination with a couple of other pilot groups for an impromptu fly in for lunch. Upshot was that 100 aircraft descended on a sleepy untowered strip within a couple of hours of each other. One guy on the ground got on the CTAF and kept people advised and everyone arrived and left safely. Assuming the perpetrators of this fly in had been aware that there would be so many participants, is there some way to get a temporary controller?