Not unless there's some type of event going on.
Not generally. But as already mentioned there are food trucks at the Sunday concerts.
If you mean on a regular basis, I'm pretty sure the answer is no. This is the information directly from the Allegheny County website Hartwood Acres Park Encompassing 629 acres in Hampton and Indiana townships, Hartwood Acres Park features free concerts on Sunday evenings from June-August. Amenities include mansion tours, teas, an off-leash dog area, and cross-country skiing, walking, hiking and bridle trails. Hartwood Acres Park is open daily, 8:00 am - sunset
There are several food trucks for every Sunday concert.
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