No, you need a ticket just to enter the building. I would suggest getting dinner for yourself or going to a coffee shop. Otherwise pay for parking and bring a book.
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I wouldn't pay for parking at the United center unless you need to be close by, it is pretty expensive. There's plenty to do in town, you could go sightseeing. Just a warning, traffic will be a nightmare leaving, yet if you expect it and remain calm you'll be alright. 😄
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