With Frieze’s No.9 joined by Stephen Friedman and Alison Jacques, and new shows by Shirin Neshat, Sheila Hicks and international indigenous artists, the classic Mayfair address is reinvigorated
From an exhibition of Zineb Sedira’s maritime works at De La Warr Pavilion, Bexhill-on-Sea, to Anne Imhof’s labyrinthine locker room at Sprüth Magers, London