Hanny's is definitely the places. Great atmosphere, not overpriced.
There are places from Hard Rock to Compass Grill at the Hyatt. Lots of choices depending on time and budget.
Hanny's is one block west and is more upscale than the others mentioned.
Compass Arizona Grille, Steve's Greenhouse Grille, Hooters....just Google: restaurants near symphony hall.
There are many restaurants within walking distance, of all types. Sports bars, pubs, bistros, you name it.
Thanks! Your answer is awaiting moderation.