Trying to answer before reading responses. I think just having the kids be mobile in their groups is the best way to facilitate this. Fortunately, my class is small, so when moving to the chatterbot activities they can be well dispersed in their groups around the room.
For the Turing Test unplugged; I think I'd like to use some sort of jigsaw scenario for this so that I get the kids mixed up and rotating their groups better.
New to chatterbot sites, so I can't offer any - will be reading on!