I would love to have a cookie swap for my girl scouts this year. I think it could be a fun Christmas party activity. I have never had one before and was wondering if anyone had tips to share for a successful one. I have 20 girls all between the ages of 5-7, how many cookies should I ask them to bring? I was thinking of buying plain cake boxes and letting them decorate them as the craft portion of the evening and then fill them with the swaps. Any tips or suggestions would be awesome, thanks!