(PITTSFIELD, Mass.) – ArtBerkshires concludes its summer 2012 programming this week with three events: a conversation with artist Maggie Mailer at Ferrin Gallery on Wednesday, August 15, 2012; a gallery tour of RETHINK!, the contemporary American Indian artists exhibition at Berkshire Museum by curator Maria Mingalone on Friday, August 17, 2012; and a Dish and…