My gun club in Western Kansas had a fatality at our annual gun show around 1986 or 87. It happened when they were going around checking to make sure all the guns were unloaded. This was before the show opened.
The story I heard was when the guy picked up a Remington 700 in 7mm Mag. it went off. The bullet hit a woman in the head killing her instantly. We carried on with the show but it just sort of ruined it for everyone.
I was at a local gun show and was asked about any concealed firearms I had on me. Stupidly, I said yes. They wanted to take it out of the holster and unchamber it. MUCH more dangerous than me keeping it in the holster.
I walked out.....and learned never to let people know you are carrying.