Most Helpful Girl
In theory they have the right to tell you to leave, if you are not a paying customer. We were talking about this with a friend just some time ago, when we were sitting at a sports bar. Technically you could just go there and watch the game and not order anything, but I would feel very rude about it and they can tell you to leave, which would be really embarrassing.
Most Helpful Guy
Sure thing if you're the designated driver.