Don Draper may have created his last ad, but you’ve got until the end of summer to immerse yourself in the world of the recently ended AMC drama“Mad Men.” Originally due to close June 14, the Museum of the Moving Image‘sexhibit of sets, costumes, props and personal production notes by series creator Matthew Weiner willremain open until Sept. 6 due to “extraordinary popularity.” The exhibit is free with admission, and we recommend dressing up. Not only will it make for better photo ops, we’d hate to see whatBetty Draper does to peoplewearing flip-flops in her kitchen.