The end of summer does not mean the end of fun. In fact, Westchester shows off the very best of its cultural offerings during the fall, when the region’s top theaters, museums, and venues present a wealth of thought-provoking exhibitions and breathtaking acts. This season will be no exception, as some of music’s biggest names are poised to alight on the county, along with a fleet of big-ticket movies, inspiring books, and side-splitting comedians. Suffice it to say, it’s high time to fill that fall calendar.