Joint Service Open House, Diverging Mediums: Things to do in D.C. this weekend High art or your standard iPhone photograph? Find out at "Diverging Mediums." (Photo by Hans Borghorst) We've pulled together a list of some of our favorite things going on in the D.C. area this weekend, including a free air show, a festival for lovers of all things Greek and an exhibit that compares high art photography and pictures taken on our iPhones. For fans of aviation or aspiring aviators, there's no better place to be than the Joint Service Open House at Andrews Air Force Base. On the ground, World War II bombers and some of the most high-tech aircraft will be on display. The real show is, of course, in the skies, where the U.S. Navy Blue Angels and the U.S. Army Golden Knights parachute team will put on aerial displays as part of an air show. By now, the white borders and faux-faded filters of Instagram have become ubiquitous with photography. For most of us, our iPhones are our primary cameras. So is there a difference between high-minded photographic art and the pictures we snap on our phones? A new exhibit at the Torpedo Factory, "Diverging Mediums: Photography vs. iPhoneography," looks at just that. Spring is here, and that means it's time to gnosh on delicious Greek food at St. Sophia Greek Orthodox Cathedral. Imagine eating roasted lamb with orzo and the fried doughy deliciousness of loukoumades, and then washing it down with the Greek lager, Fix. The annual Spring Festival also features traditional dances and musc.