Hogwarts in Middle-earth

In the final battle of DH Voldemort curses the ward stone of Hogwarts and everything within those wards disappears. Meanwhile on the edge of Fangorn Forest, near the Limlight, a castle appears full of people. Arda may only have been expecting five wizards there are now a lot more, and the world won't know what just hit it. Canonical pairings. HP-centric. Through to the Fourth Age.