Group usability activity?

I'm trying to come up with a fun yet somewhat informative usability activity I
can do with a large group of customers in an hour.

Why fun? Because this will be a large group, fried after a long conference
day, and we'll be providing beer and snacks. The conditions are far from ideal
for holding their attention and accomplishing anything serious, so I want to
make sure it's light and enjoyable.

Why somewhat informative? Because otherwise why bother? I do want to get some
contact info and buy-in on doing usability tests in future, but I'd like to
get a _little_ more out of it if I can.

I'm guessing we'll have at least 10 folks, but if fewer people bail than I
expect it could be up to 60 at the most. I was thinking maybe of some kind of
cardsort, perhaps in teams, or something designed to gauge attitudes and
perceptions rather than gather any hard data to speak of. It's possible I can
get people to focus and take it seriously, but I'm going on the assumption
that I probably can't.

Any ideas or advice? I hate to waste any opportunity to talk directly with
users. Even if it's just some kind of facilitated discussion, that might be
good.

Thanks!
Drew Simchik
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