A real emergency

This weekend I need to make a powerpoint on electricity, only one problem: I left my notes in my locker! There is only two possibilities: either get the notes on Monday and quickly throw my powerpoint together, or go to the school on Saturday and get my notes. The school is open to 12:00 on Saturday but it is only for Saturday school( a form of detention on Saturday). I just don't know if I can go into the school and get my notes. It's like my own little adventure even though tommorow is my unlucky day. Wish me luck!