Twittering for Concert Lovers

Do you follow your favorite music artists on the web?
Just a tip: sometimes artists twitter about hiding concert tickets in the area around their venue right before the show.

@eminem did it. so has Lily Allen, and apparently Britney Spears, The Ellen Show, Shaq, and other famous twitterers.

How could you apply the concept of Twittering local promotions in your area?