We got a card in the mail (that probably should have been a sign this wasn't going to be worthwhile) for a home show in San Jose and decided to check it out today:
http://www.acshomeshow.com/

We were hoping to see a lot of manufacturers (windows, flooring, tiling, landscaping products, etc.) and get to see and touch product samples, but it was nearly all local contractors—not useful for us, unfortunately. It wasn't very big, either. And to be honest, I'm not sure how useful this would be to most consumers, unless they had very specific contractor needs. There were also a number of vendors that I didn't find particularly relevant to home remodeling—start-your-own printing business from home, small craft-like home decor products, etc.—that was pretty weird.

The photos on the ACS site show many more manufacturers' booths, so their shows in other cities might be better. But as for the San Jose show, I don't recommend it.