Sunday matinee improvised music monthly: music and visuals special with Laure van Minden/Michelle Brace/Chris Dowding + Jakub Rokita/Tomasz Glazik/Viv Corringham + Gwendolyn Kassenaar/Hyelim Kim/Maurizio Ravalico (21 September), Panos Ghikas and family and friends + Stephen Grew + Maureen Wolloshin & Stevie Wishart (19 October). London The Vortex, 2pm, £12–£8.