Sorcerer'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.