L'Aquila's big annual event is La Perdonanza on 28 August. This colourful celebration goes back to 1294 when Pietro del Morrone was crowned Pope Celestine V in the Basilica di Santa Maria di Collemaggio. In an act of largesse, Celestine granted plenary indulgence to everyone present who had confessed and taken Communion. Since then, every 28 August, the pardon has been repeated. The grand pardon is preceded by a 1000-strong costumed procession and a week of highly charged celebrations.