It depends on the concert and the mood you will be in afterward. Stanley's is a staple and very close to Park West. Dinner there is good, it's bar food with a more of a home cooking feel. If you don't eat there before the concert, it's a good place to go afterward. Another option is Topo Grigio on Wells, it's Italian and would be good for drinks and dinner. Again, depends on the vibe you are looking for.