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Tate Gallery: Clement Page, "Marcel Duchamp and the Subversive Gesture", 1pm.

National Portrait Gallery: Paul Bainbridge, "From Clay to Wax: creating portraits at Madame Tussaud's", 1.10pm.

University College London, London WC1: Professor Terence Irwin, "Plato and Meta-ethics: from Cudworth to Price", 5.30pm (Gustave Tuck Theatre); Professor John Tait, "Ancient Egypt in Context: comparison and contrariness", 5.30pm (Darwin Lecture Theatre).