I remember working dog shows there when I was in Scouts (clean-up crew, blech, but an excellent fundraiser). It's 60,000+ square feet with nothing but columns to hold the roof up and doors big enough to drive pickup trucks through. There's also a concession with full kitchen in the lobby that the Fraga organizers could probably arrange to have open at certain times of the day.
I'm willing to bet that the Sportex is significantly bigger than the Mayfield Trade Center, so if Tent City sprung up again there'd probably be more room for tents.