Search on Google map there is a lot of parkings in this area. One is 5 min walking distance from the Theatre for only $25 when you book online for 8 hours.
There is a parking lot with the entrance off of lake street. Pricing can varying if you have a parking coupon from the venue or not.
I use ParkWhiz, various rates in the area.
Best bet will probably be a service like Spothero. Discounted rates on surface lot and garage spaces. You can usually find a spot in the Grant Park North garage for $13-$14 that way.
Dearborn and Randolph has parking for about $35
Ride the train in its a blast
There are plenty of parking garages within walking distance, parking can be pretty expensive $15+ (will depend on how long you will be there). I would recommend using a parking app to reserve a spot and possibly save yourself some money
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