I believe I saw something where you would be at ISTE 2012. How about creating some ALL conference polls that they announce on the PA system and then everyone can text answers and they can display the data on the conference screen.
How many of you plan on attending the keynote speaker this evening?
Then giving real time data! I would love to evaluate they snacks they serve us. I can think of lots of little survey questions you could embed for the entire conference attendees and exhibitors.
I love being innovative and creative!