Because Coachella is dumb and expensive and hot and lying about it on the internet is free.
Talk about it a few days before, but don't overdo it. One tweet should suffice.
Check in on Facebook AND Foursquare when you "get to the airport."
It might seem weird, but you want to cover your bases and make sure all your followers know you're leaving.
(Plus, neither Facebook or Foursquare actually need you to be in the place you say you are to check in there.)
