To help the Cleveland Museum of Art celebrate its 100 year anniversary, other museums are lending masterpieces from their collections to the museum. In honor of this historic time, the CMA is hosting a special series of Centennial Chats with curators and educators from the CMA. At 2 p.m. today and tomorrow, the discussion focuses on Barnett Newman’s Onement IV, on loan from the Allen Memorial Art Museum. Meet in Gallery 227. Free. (Usmani)