Not to be a person to put a "DOA" thought on this idea, by doing this, it puts Fenway and INGO in the legal explosion if a 1500 attendee happens to blow off his pinky or or have discharge in a manner that would ricochet off it and hit someone.
INGO does not have to have liability insurance since it's a internet forum.
World Class Gunshows on the other hand more than likely has to have a huge liability policy in place that is required by the Indiana State Fairgrounds.
Besides it's the organizer that requires no loaded firearms, so it should fall fully upon the shoulders of them for providing a safe area to unload and load when entering and exiting the show.
Again, ditto.