Luxembourg & Dayan, New York: Arte Povera and After preview 6-8pm Victoria Miro, London: Stan Douglas artist's talk at Tate Modern 6.30-8pm Thu 26 Di Donna, New York: Nuvolo and Post-War Materiality preview 6-8pm Gagosian, New York: LA Invitational preview 6-8pm Lullin + Ferrari, Zurich: Slawomir Elsne