At this time of year, I also get a lot of calls from high schoolers desiring job shadows. I think this is a great idea and can be a worthwhile experience for the student, but for a busy planner it can almost be overwhelming to try and convey the concept of who we are and what we do in a one-day experience, which is what a lot of students are asking for. I even have schools asking for a one-hour job shadow. Unfortunately, it would take ten times the amount of hours to prepare a useful curriculum, than what the student and I would actually spend together, based on what schools and students are asking. So I usually decline.
One thing that I think would make high school job shadows more appealing to event planners would be if, rather than a one-hour or one-day event, students would treat their job shadow just as importantly as a varsity sport or other extracurricular activity such as Debate, Math Club, etc., and plan on signing up for at least a 90-day experience, perhaps with four to ten hours per week spent on working for their job mentor. This way, both the student and the mentor can benefit from the experience. And event planners would be more likely to accept more students.