Commemoration Week is so known because of the ceremonies in commemoration of the benefactors of the university that are held then, namely the Commemoration Day sermon formerly held (until 2006) on the Sunday, and the Encaenia ceremony (where the annual Creweian Oration in honour of benefactors is given) and garden party on the Wednesday of that week. Commemoration Week was formerly one of two occasions when balls were traditionally held, the other being Eights Week, the 5th week of Trinity term when the Summer Eights rowing races occur. Eights balls are nowadays comparatively rare.