Here's a link to the largest convention centers in the U.S. Austin's is number 25, which isn't too bad. Chicago, Orlando and Las Vegas are the top three and have huge convention centers. Las Vegas in fact, has three convention centers larger than Austin's. But Austin benefits from having its convention center surrounded by maybe ~200 bars and restaurants within several blocks.
http://comicsbeat.com/which-us-conve...er-is-biggest/