Ask HN: Source for address data of event facilities?

I'm working on a startup idea that needs access to address data (and ideally, though not absolutely necessary, GPS) for large concert halls/coliseums/college arenas/sporting complexes/etc. Essentially, anywhere a large event might be held, be it a football or basketball game, concert, and so on. I'd like to begin with US locations, but eventually expand globally if the US market proves the idea.

Is my only option for this sort of information to hire someone to manually track down and enter it, or is there somewhere I can go to perhaps purchase access?

Thanks guys.