Mark your calendars for the FREE Chicago jazz Festival, which will take place on August 31 through September 2 over Labor Day weekend. This year, the 39th Annual Chicago Jazz Festival will celebrate the 100th birthdays of Dizzy Gillespie, Thelonious Monk, and Ella Fitzgerald, and headliners include Donny McCaslin Group, Dr. Lonnie Smith Trio, Allison Miller Boom Tic Boom, Dr. Michael White Quartet, the Rebirth Brass Band and more. The schedule is organized so that there will be a whole day devoted to each of the music of Gillespie, Monk and Fitzgerald. The festival will include four stages of free live performances by a large pool of Chicago jazz talent and others from around the world. It’s programmed by the Jazz Institute of Chicago .