I'm not sure if they have food for the regular concerts, but they do during the festivals. It's not very good, though. There are tons of restaurants within the few blocks around the yachting center, so if you've got the time for dinner before the concert I think it's worth the extra stop.
And while I'm out of hiding over here... a coworker just had a baby girl on Friday and named her Clare Ailish, and Irish names make me think of you/S!