Chicago Tribune: RECRUITER Q&A With Hard Work, Seasonal Job Could Become Permanent
"Q. How can job seekers improve their changes that a holiday job will become permanent?
A. Once you secure the position, this is the time to mention your desire to stay after the season ends. It's critical to demonstrate that you're a valuable member of the team. Thus, you not only have to do what's asked of you (and do it well), but you also have to go above and beyond. Ask for additional responsibilities. Be available to work whenever the employer needs you."