But, she also thought it strange that they were gathering in London. Why? The Dark Lord hadn't strayed far from Hogwarts in a very long time. When the war was lost and he reigned supreme, he chose the ancient school as his headquarters, his court. Lord Voldemort desired having the children close by. He wanted to shape their ideals, their thoughts into something that he could manipulate. Control the children and one controls the world. Over time, it just became a necessity that he remain where he was. Though no one was foolish enough to say so out loud, they all knew he was weakening to an alarming degree.