The Glastonbury Festival was a music festival held in the town of Glastonbury. It was set up in 1970 to feed the psychic weapon the Tor with positive emotions such as joy. (PROSE: Piece of Mind)
Ace once attended the festival. (PROSE: No Future)
When on the Twist, the Twelfth Doctor mentioned the festival while talking about open-air concerts. (COMIC: The Twist)