When pianist Inon Barnatan returns to Ravinia on July 21, he’ll be there to extend the history of an institution. The festival has been hosting a high-spirited, evening-long celebration of Tchaikovsky every season for now 40 years. The Russian composer’s tuneful, dramatic ballets and symphonies are among the world’s most beloved classical pieces, and every year since the early ’80s, Ravinia’s “Tchaikovsky Spectacular” has ended with a rousing version of the 1812 Overture, complete with live cannons. This summer, for the first time, the ever-popular event occupies a full weekend, July 21–22, with concerts featuring the Chicago Symphony Orchestra and conductor Ken-David Masur. The Violin Concerto—with Miriam Fried, the venerable, 25-year lion of Ravinia’s Steans Music Institute, as soloist—is the centerpiece for July 22, the traditional Sunday concert, and Israeli-born Barnatan is joining the CSO as soloist in the First Piano Concerto.