There is meter parking along Walnut Street. Usually you only have to pay up to a certain time. I am guessing 10pm thete. So if are attending a show at night, you only have to pay up until 10pm.
Penn Park. Drive down Chestnut and hang a right. On left on 31st street and Lower Walnut.
There's a garage on 30th street just north of walnut. But street parking is usually available and obviously much cheaper
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