Four events in London celebrating the improvising guitarist on the 20th anniversary of his death: New Sights, Old Sounds screening of rare film and video material documenting Bailey's encounters with improvisers around the globe (Barbican Cinema, 14 December), Company 2025 featuring ten musicians – including John Butcher, Charles Hayward, Khabat Abas and Julia Brüssel – in ad hoc groupings compered by Stewart Lee (Cafe Oto, 15–16), Remembering Derek: Thurston Moore & Mark Wastell (The Vortex, 17). Various times and prices.