Philosopherer's Stone: We're probably gonna need to close Hogwarts.
Chamber of Secrets: We should really consider closing Hogwarts.
Prisoner of Azkaban: Sooo are we closing Hogwarts?
Goblet of Fire: Someone died we should really close Hogwarts now.
Order of the Phoenix: Nope? Not closing Hogwarts?
Half-Blood Prince: Really guys it's time to close Hogwarts!
Deathly Hallows: Hogwarts is kinda blown up guys, do we close it now? No? Great.