Be prepared to bring the party to a local bar
While in some cities, like Milwaukee and Kansas City, tailgating at MLB games is practically a rite of passage, in others it’s just not going to be feasible. Some ballparks are specifically designed to be centrally located, or easily connected to public transportation, and you’d be a bonafide moron to try to park your car there. (Looking at you, Bronx Bombers.) There are some that completely outlaw grills in their parking lot. That means you may be bringing your pre-game “tailgate” to a favorite local sports bar instead.
In New York, The Dugout is conveniently located across the street from Yankee Stadium, and is a regular spot for fans to hit before the game. In Chicago, The Cubby Bear is the spot in Wrigleyville -- for before or after the game. But you can also try to find an unorthodox choice nearby that will give you more wiggle room. Most bars that don’t serve food are fine with you bringing your own, and if a place isn’t a sports bar, you can call to see if a small gathering is welcome and can get the game on the screen.