The Wizengamot sent a message to Albus Dumbledore in order to notify him that the time and place of Harry Potter's disciplinary hearing had been changed to three hours earlier and in Courtroom Ten. As this owl was sent the same day as the hearing, Dumbledore missed it and only made it in time, due to a "lucky mistake". Harry Potter was sent a similar letter, but did not receive it. He ended up arriving at the hearing five minutes late after Arthur Weasley was tipped off about the change of time and venue by his colleague, Perkins.