All you have to do to earn the foursquare NBA Finals Badge is like the NBA on foursquare and then check-in to one of the games. You will then earn your shiny new badge and see the following message:
It all comes down to this. Stars become legends. NBA history is made. And YOU get to witness it first-hand. This is the NBA Finals!
Good luck unlocking the new badge and Go Spurs! (I’m a Celtics fan)