Perry didn't win any Grammys this year, although she did snag a nomination (for Best Female Pop Vocal Performance), and did perform live at the award ceremony this past February. So we suppose that's reason enough for celebration.
Joining her for this gig is Wyclef Jean, who wasn't nominated for any Grammys this year, but is enough of a hero locally to remain a draw.
The show is free, but of course there's a corporate sponsorship tie-in. To gain admission, you'll have to visit a T-mobile store and buy a Sidekick, or show the Sidekick you already own at the door. If you're more of an iPhone or Blackberry (or, OMG, flip phone) type and are super-motivated, you can also go play a specially themed game at a T-mobile store, no purchase necessary.
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For full details visit www.sidekick.com/grammycelebrationtour_mia.aspx.