What question could I ask?

You’d think we’d be able to come up with something clever. I guess all the ideas are in NYC :(

hmm. interesting. is the video going to be recorded before the event? for example will the people need to be able to show what is in their pocket? here are some ideas that will return with a variety of answers that could be very telling about the people involved:

what was the last thing they ate? or what do they keep beside their bed? what the best present they ever recieved was?

two questions that i love for breaking ice and going around a table at social gatherings that are sure to come back with a myriad of funny stories are “what is the worst job you ever had?” and “what is your worst date or sex story?”

I am not sure I understand the “Interesting Conference” is.

I went to the sight and am still not sure.

A possible question is:
What is your predominant feeling about this conference (or smth else), please mime it.

My computer did not like that site… Is it an idea conference?

I like nina’s suggestion! To expand upon that… You can make them mime anything. How about you make up a word with a given complex meaning (for instance, tell them in the video that “loogaroo” means “the lock of hair that sometimes falls into the face of a person” or “someone in the hurry to catch the bus” and that they must come up with the sign language for this new word.

Or tell them to pull out their mp3 players and play a random song. Get them to dance to it all at the same time. If they don’t have an mp3 player? Well, they can sit back and enjoy the show. It’s kind of like Improv Everywhere’s MP3 Experiment, but less refined.
You could tell them to dance with their eyes closed too, but that could be dangerous.

The possibilities are endless.