The adviser might bring in a batch of cookies or a cake for the first birthday celebrant of the year. That person, in turn, brings in treats for the next birthday celebration. The cycle continues until all birthdays are celebrated. Don't forget to include the adviser. Feed your Staff.
Food makes for happy students.
If it's getting late, order pizza and take a break. Pizza breaks allow for socializing and create space for staffers to laugh, joke, problem-solve and restore their energy for the tasks at hand. Smart editors reward staff members when deadlines are met. A small token of appreciation does wonders at lifting the spirits. The point is to let the staffer know you value his or her contributions to the team.