Food near First Mariner arena
Going to the Springsteen concert anyplace within walking distance of first mariner can even be bar food just not to grungy
Frank and Nic's is a couple of blocks away, in the Zenith building. It's good for what it is - a step up from typical bar food, but still reasonably priced. There are also some pricier entrees, but I've stuck with the apps and sandwiches and haven't been disappointed. It will be happy hour when you're there, so you could just get a bunch of the $5 apps and be set.