This sounds like so much fun....I think we may do this also. At our AHR we planned on doing something similar by placing disposable cameras on the table with a little poem....and then just develpoing the pics.
Here's the poem:
I am your camera, so scavenge around,
Hunt for those pictures that need to be found!
Shoot away and complete the list,
Find moments that the Photographer may have missed!
Snap Away as best as you're able,
Then leave me here right at your table!