"The investigation determined the shooting to be accidental, and no charges will be filed," police said.
Shootings occur as gun debate rages
Reforming private gun sales -- at shows or anywhere else -- is among the changes that President Barack Obama is now seeking by requiring background checks.
The president has called for action in the wake of last month's shooting at a school in Newtown, Connecticut, which left 27 people -- 20 of them children age 7 or younger -- dead. Gun control activists have likewise pushed for changes, while gun rights advocates have said restrictions on gun sales are unnecessary and in defiance of their Second Amendment rights.
Currently, federal law requires background checks on gun sales by federally licensed firearms dealers, who are often among the vendors at gun shows.
Saturday's incidents occurred on 'Gun Appreciation Day," an event led by a gun rights group that urged Americans to "go to your local gun store, gun range or gun show with your Constitution, American flags and your 'Hands off my Guns' sign to send a loud and clear message."
Sen. Charles Schumer, a New York Democrat, last Sunday issued a statement predicting this event would drive up sales of things like "assault-style rifles," which have already "skyrocketed" in the wake of the Newtown mass shooting.
Jabari Richards, a gun enthusiast, told WRAL at the Raleigh, North Carolina, show that he thought some reforms were wise.
"I think there should be background checks for everybody," Richards said, "because then you know they ... are capable of having a gun."
But another man at the Raleigh show said it was useless for Washington to step in.
"The gun laws that they have on the books aren't enforced, don't do any good," Al Galbraith said.