I didn't do demos, per se, but I thought you might be interested in my experience this year at Marcon. Marcon is a science fiction convention which featured Looney Labs as the Gaming Guests of Honor in 2007.
When I go to events like this, I'm always torn between the desire to take games with me and the desire to not have to look after them once I get there. This time, I solved that dilemma by clipping IceDice to my belt. My IceDice bag has an extra stash and enough extra bits to play Treehouse, Black Ice, and Twin Win, among others.
Unfortunately, there weren't many people boardgaming this year at Marcon, and there were other things outside of gaming that I wanted and needed to do (I had a panelist ribbon, which came with certain committments). Still, every little bit helps, and I was able to get the pyramids to the table for several games on Friday, as well as talk about them at various points throughout the weekend. For example, the Art Show requires that people check their bags before walking through, so I had an interesting conversation with the volunteers up front as I checked in my IceDice bag.
Plus, as it happens, on Sunday I encountered a couple of people who were getting ready to play the copy of Back to the Future they had just acquired from the Dealer's Room, and I was able to help them get started and play a couple of games with them. And briefly talk about IceDice, of course.
All in all, a successful experiment, if only a tiny one.