By definition, you have to be in the same place as a band be able to hear them play live in concert, which is why it is crucial to know A) where you are and B) where the bands you like will be.
You usually know A. Why not let a web service do the rest? Something called Foafing-the-music sets out to do just that. There is a demo here, and all of it is exportable to Google Earth.
Well, moreover, you can see incoming gigs of your favourite and recommended artists in a Google Map.
Of course you have to log in (or try the demo) to the system.
Keep foafing the music!
Cheers, Oscar.