Planning around an arena or stadium seems pretty straight forward, people will generally want to have somewhere to eat before or after a game, maybe some drinks, so you have to put a few pubs in there. Then you needs lots of parking. You will also have a bunch of people who do not have tickets to the game who just want to be near the stadium to watch it on TV, so MORE PUBS. Then you have to have somewhere to celebrate after a big win, so I would recommend some pubs for that. Oh and I guess transit options in the area so people don't get tempted to drive after going to the game or pubs. The other stuff that would be good to have around is some food carts, because when you've been drinking a solid food cart taco really hits the spot. Maybe a team store around there too, just cause.