Oriole Park is a venue in or near Baltimore that is most often used for Baseball
I suggest you try the Pickles Pub/Sliders bar since they have a bunch of great appetizers. Cans of Natty Boh can be had for $2 and other drinks like Corona can be bought for $1 with other purchases. Abbey Burger Bistro is one great choice. The beer selection is good, and they offer a great burger with onion rings and BBQ sauce after Adam Jones.
Pickles hands down. If you have never been to the stadium and want the true experience, go to Pickles. You should really go early enough so that you can go inside and get a table to sit down and have a meal. I always get the fish and chips and maybe their fried pickles. It's not surprise that their pickles are amazing. If you can't get a table, still go and just stand outside with your friends and socialize.
Skip pickles and sliders which are always packed. A short walk down Pratt Street will get you to the Pratt Street Ale House! Great food, craft beers and great outside seating. It is a great place to go before the game or after.