I know what you're saying. Except here, Kershaw and CRKT are almost unheard of. Buck, Gerber, Leatherman, are the standard stock. People here also buy knives from Browning, Winchester, and Smith & Wesson because of the firearms association.
Go to the places where you want to set up your booth, and talk to the other vendors. Not as "Klay Kutlery", but just as a regular person who's there to browse, and maybe buy something for your nephew, who's into knives.
Doesn't matter if you really have a nephew, or not. Just for conversation purposes.
Obviously, don't take notes right in front of the other vendors, but you should be able to get an idea of what does well, and maybe where there are some unmet needs in the retail space. So to speak.
You may find that "knife adjacent" products are what really does well: gardening knives, machetes, axes. You may also have some success selling vintage axes, and painted sawblades, but we're a long way from strictly knives now, aren't we?
There's a fine line between "realistic" and "cynical", and even I have trouble telling which side of it I'm on. I know from the flea markets and suchlike in this area that "good" knives are a hard sell. Most of the guys who start out trying to sell Cold Steel, Kershaw, or CRKT, eventually either move to another market, or liquidate their stock. If people do well selling knives, it's because they're cheap and cool. Balisongs, "tactical" knives, and tantos, do well. These same vendors also sell pepper spary, and cloth goods celebrating the 2nd Amendment.
Before you get too deep in money or time on this, I would caution you to take a long look at your reasons: do you want to make money, or do you want to sell "good" knives? Because those two things may not be the same.
And, while I was writing this,
@220-9er said it shorter. Oh well.