Sounds like fun. Get a bunch of gun folks out with bright white cowboy hats.
As a matter of fact, I propose that the open-carry movement be officially called the "White Hats," with the state name, such as "Nevada White Hats," "Arizona White Hats," etc. If the hoplophobes are going to call us "cowboys," let's turn that around on them by being the GOOD cowboys . . .which leaves only one part for them to play.
Also get a small group wearing burglar-clown suits, marching with a banner "Burglar Campaign to Prevent Gun Violence -- against criminals!""and running around screaming "It just ain't safe to be a crook around here, when all the good guys have GUNS!"
Maybe even get a handcart carrying Eddie Eagle signs and comic books to hand out to the kids.