Hi Mark - I've been to quite a few gun shows. The Ohio Gun Collectors Association (OGCA) used to be one of the largest ones in the world (may still be). When we went (and actually exhibited a couple times), the shows were held in a very large auditorium in downtown Columbus, Ohio. The show filled the exhibition space of the auditorium to overflowing. There was no admission to the show but people who came to look had to be members of OGCA or a guest of a member. Exhibitors were charged a rental fee for each table they wanted (standard 2&1/2' x 5' tables).
It was really a weird feeling the first time we went to see people walking around carrying all types of firearms and other weapons to hopefully sell to a dealer at a table or that they had just bought. One of the interesting people was a dealer from France who flew over for every show. His objective was to buy French weapons that had been here since the Revolutionary War or earlier.
There was a wide variety of guns displayed - matchlock and wheel lock pieces, dueling pistols, Brown Besses from the Revolution and Brown Besses that had been cut down for foraging guns during the Civil War, cap and ball pistols, Winchesters and Colts from the wild west, German Lugers, and of course, the full array of normal guns you'd see at a gun store but some of them so ornate all you could do was let your mouth drop in awe. (I remember one over/under shotgun in particular).
And yes, there was some other stuff - custom made knives, Civil War uniforms, German helmet insignia, medals, many displays of books and other literature, powder horns, antlers for making knife handles, fancy wood pieces for making stocks, bullet moulds, re-loading equipment, etc. etc.
One of the funniest (to me) memories I have of the show is of minding our table while my husband was out drooling. Did you know that men who go to gun shows have the most ornate and interesting belt buckles you can imagine? (And of course, that's what was at eye level when I was sitting behind the table.) It was a lot of fun and very educational (at least to me who asked a lot of questions.) Puma