The crowd continued to swell; with a great rush of affection for both of them, Harry saw Neville being helped into a seat by Luna. Neville and Luna alone of the D.A. Had responded to Hermione’s summons the night that Dumbledore had died, and Harry knew why: They were the ones who had missed the D.A. most . . . probably the ones who had checked their coins regularly in the hopes that there would be another meeting.

Harry Potter and the Half-Blood Prince – J.K. Rowling