Millennium Park will celebrate its 20th anniversary with a concert by Common and Grant Park Orchestra

From July 18 to July 21, the city will present everything from public art installations to dance performances; all of it free programming for the whole family at Millennium Park.

Next month marks the 20th anniversary of Millennium Park's opening, and Chicago is throwing a four-day-long celebration to mark the milestone, topped off with a headline concert from Grammy and Emmy Award-winning hip hop star Common alongside the Grant Park Orchestra.