The Islip Art Museum celebrates summer with an exhibition entitled Flag Day, on view in the museum galleries at Brookwood Hall, 50 Irish Lane, East Islip, NY:  June 15 through Sun. Sept. 4. 2011.  http://islipartmuseum.org/about.html Flag Day was curated by Janet Goleas, an artist, gallerist and writer. The exhibit explores the way flags and banners convey attitudes,…