Ask the place where Shanghai Normal University Xuhui Campus studies for itself during the winter vacation!
I come from this school. Xuhui campus is the main campus, which is open in winter vacation. Because Xuhui is in the urban area, the place is relatively small. You have to swipe your card when you enter the library. Not if it's in Fengxian, hehe. But if the librarian isn't there at that time, or you don't pay attention, then you can sneak in.