A term-time reunion is held every year in early-middle June on the same day as Castle Day (some years this is also the weekend of the Durham Regatta). This is intended for graduates of the last 5 years and there may be some sporting challenges between the JCR and graduates. Returning Castlemen are invited to join the Castle Day BBQ in the Courtyard and the festivities of the day - including Iron Man of Castle.
The Castle Society organises a major reunion each year. This is held over a weekend in September for all graduates and friends of the College and culminates in a Reunion Dinner on the Saturday night. The first one of these was held in 1946.