Festivities begin with a tree lighting outside the Wrigley Building featuring Grammy-nominated singer, actress and Broadway star Deborah Cox, plus the Chicago Carolers.
On Saturday from 11 a.m. to 4 p.m., at Lights Festival Lane at 401 N. Michigan, there will be free activities including a DJ, photos with Santa, and the Eli's Cheesecake's 30th Anniversary Lights Festival cake plus free cheesecake.
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Eli's Cheesecake owner Marc Schulman founded the event 30 years ago.
Saturday is the 30th annual Magnificent Mile Lights Festival Parade.
Mickey and Minnie Mouse as well as Santa will help celebrate the turning on of more than a million lights along Michigan Avenue. The parade starts at 5:30 p.m.
ABC7 will broadcast highlights of the parade at 6 p.m. on Sunday. The one hour broadcast will re-air on December 11 and on Christmas morning.