Damn, that freedom and tolerance thing again. And the Bill of Rights. There are about 10 major gun shows held annually in the Tucson area. McMann does three at the TCC, while the Arizona Arms Association and other promoters stage the rest, usually at the Pima County Fairgrounds. In the old days, there were others at smaller locations such as the Sabbar Shrine, but they have folded because shows are now dominated by a few large dealers needing plenty of room.
Space is what it's all about.
Gun shows now attract thousands of people, to the chagrin of the opponents. McMann could probably move his to the county fairgrounds, where there's a governing board with both less hoplophobia and less power to regulate, but that would cost him folks who wouldn't make the long drive. Others don't like being run off public property. Moving the shows presents another irony. Everyone concedes TPD is understaffed.