Here's a short list of some of the bigger local shows, there are more that are smaller regional shows, but this is what I could find easily.
Colorado Dive Show (September 24 -25, 2010)
Florida Dive Show (December 3 - 4, 2010)
Baltimore/DC Dive Show (January 28 -29, 2011)
Our World Underwater (February 18 - 20, 2011)
Texas Dive Show (February 25 - 26, 2011)
Beneath the Sea (March 25 - 27, 2011)
Bay Area Show (April 8 - 9, 2011)
Tacoma Dive and Travel Expo (April 9 - 10, 2011)
Long Beach Scuba Show (June 4 & 5, 2011)
Colorado Dive Show (September 24 -25, 2010)
Florida Dive Show (December 3 - 4, 2010)
Baltimore/DC Dive Show (January 28 -29, 2011)
Our World Underwater (February 18 - 20, 2011)
Texas Dive Show (February 25 - 26, 2011)
Beneath the Sea (March 25 - 27, 2011)
Bay Area Show (April 8 - 9, 2011)
Tacoma Dive and Travel Expo (April 9 - 10, 2011)
Long Beach Scuba Show (June 4 & 5, 2011)