The convention center has wifi available for purchase, but it's pretty expensive. $184 for the show duration with the advanced rate (due Monday). They basically will give you a username and password to log onto their shared wifi when you arrive. The order form is in the SmartCity pdf on the haa site.
If you have a phone or tablet with cellular service, I'd say use that. For our computers at the show that need internet service, I just grab the cricket or sprint boadband dongles.