If I am reading this right, there are two locations, the convention hall and the stadium.   Is that right?  They seem pretty far apart. How do you get from one to the other? 

They're on adjacent blocks. They're not that far apart. If you look on a map, you'll see where they are in relation to each other.

There are two ways to get from one to the other. One way is the obvious: Just exit the southeast door of the ICC and head across the street. It'll be blocked off for food trucks, so crossing is no problem.

The other is to use the underground connecting tunnel. There will be some booths there, so that route can be interesting too. 

Keep in mind that the convention also has events in the surrounding hotels. The JW Marriott, the regular Marriott, the Westin, Hyatt Regency, etc. And also in Union Station. Gen Con takes up more than just the convention center and Lucas Oil Stadium.