- Each stand in the stadium,
- Parking lots in and around the stadium,
- Nearby areas of interest, etc.
Considering the nature of the crowd that will be coming in to the stadiums you might also consider mapping all the waterholes around the stadium along with the best restaurants and hotels (who knows, one of these might even be hosting the teams playing!)
If you need pointers, see how other mappers are going about mapping out their favorite stadiums. And if you are too late to map one of the 13 venues, remember there are other great stadiums you can help with.