April has been designated Jazz Appreciation Month (“JAM”) at the Smithsonian and as a result, the month will be filled with concerts, lectures, and other assorted events to celebrate this great American art form. Here are just a few of many highlights taking place around town: >> The Smithsonian American Art Museum offers a museum jazz tour every Thursday at 4 p.m. and every Friday at 12:30 p.m. throughout the month. >> The Smithsonian Jazz…