I always find that it's necessary to review the rules around this time of the year. Based on their school behaviors, are your students going to make the nice list or the naughty list?
Have them review good and bad behaviors with this stocking worksheet. They should write good behaviors that will be on the nice list in that stocking (sharing, taking turns, using inside voice, walking, etc.) and then bad behaviors that will be on the naughty list in that stocking (yelling, pushing, running in the halls, outside voice, etc.)