Be sure to follow what you’ve proposed and follow school rules. If you have a poster or something similar, be sure to monitor your work in case immature students attack it. And make sure, also, that you do not leave anything behind – no pen marks, staples, nor adhesive.
Don’t forget both to document your work existed (take a photo) and make written observations about how people interacted with your art. What did they say? Do? How did your art influence the students? the culture of Skyline?