Free parking on sundays, paid meter parking along ballpark, or paid private parking lots.
We paid $8 at the big 10 tournament but then tailgated and came (to the parking lot) and went between games. Well worth it for that.
Some meters downtown aee 2 hrs and go to 10 hours and meters do work on weekends. Find a 10 hr meter and take the stadium circulator
If you don't mind walking there are places by the river that are free. Was as at bigten tournament. Paid $8 for that
Public parking all over, might have to park 5-10 blocks away though if you want a free spot.
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