If you want a nice place to go after the show, head out the front, turn right, then turn right again at the end of the building. There's a wine place called Cork Soakers.
http://corksoakershouston.com/specials.html
It's a great place to go and enjoy good company, food and some great wine. The lady that owns the place is really great! Last year, she had BOGO coupons at the information desk at the show.
Also, if you have too much to drink, they have a shuttle (just give a tip) or if the shuttle has stopped operating, they will call you a cab.