The night before, when we were setting up, I noticed that volunteers were putting cookies in small snack sized Zip-Loc bags.   Of course, my "trash-radar" went up and since I could not avoid the baggies, I could gather them and send them to Terracycle.  So, I prepared a box with a sign asking for the empty baggies to be put in the box. While I still had to raid the trashcans, there were many baggies put in the box!  (mind you I had to take baggies out of the 'plastics' recycling can and cardboard boxes out of the 'plastics' recycling can!)