I've been to the Texas Guitar Show here in Chicago a few times.
One thing you'll notice is that the vintage guitars are waaaaay overpriced.... in fact, I'd go as far as saying that the prices are a total rip-off.
The only worthwhile deals I saw were on new "blemished" Seagull acoustics and some blemished Alvarez acoustics... which were close to 30% off the regular price because of minor (virtually unnoticeable) flaws in their finish.
If you're going there just to view all of the "eye candy", then you'll have a decent time. You're going to see some really nice vintage guitars. Just go there with extremely LOW expectations.
Also, you have to realize that many of those vintage guitars have had parts swapped out, thus de-valuing the guitar. The sellers will RARELY tell you that some of the parts are not original, and they'll still charge you the higher "all-original" price. Another thing to look out for is the all-out fakes. There's alot of Strats, Teles, and Les Pauls out there that are very convincing fake-copies of the much-desired 50's and 60's models....right down to the yellowing, fret-wear, and belt-buckle scratches. If you don't know how to spot the warning signs.... DO NOT BUY! Many of the sellers travel from long distances to the show and you'll never see them again.
Be VERY cautious if you plan to buy a guitar at a guitar show.