does it cost to park for graduation event

I work there. The Bay Center does not charge for parking for graduations. Other surrounding businesses sometimes charge to use their lots though. A parking fee is charged for most events. The fee depends on the event. Hockey is usually $5, other events it's usually $10.

No charge for parking

Yes, if you can't get free, it is $10.00

Yes but there's plenty of free parking across the street. And on neighboring streets and parking lots.