What airport would I fly into to attend concert here ?

Well, no airports are particularly close to my knowledge. But, Newark international may be your best option, as it isnt too far north of the venue.

EWR Newark airport

Newark Airport then take a taxi or uber and take the parkway to PNC Art Center.

EWR is the closest major. Trenton Mercer may work from some locations.

ERW

Newark, its about 30/45 minutes north

Newark is the closest

Newark.

Newark NJ philly international JFK depending what state you live in