Billboard Promoting Awesome Metal Show Will Forever Be on I-10

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If you have driven on the eastbound 10 just past Fantasy Springs Casino, than you have noticed a killer festival is coming to The Coachella Valley.

The billboard announces huge metal acts Metallica, Slayer, Megadeth and Anthrax playing on April 23rd at The Empire Polo Club in Indio! What the billboard does not mention is the year of the festival (which was 2011).
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So why is this billboard still up? Is it that the billboard company is just too lazy to take it down? Or, is it actually still up because, unbeknownst to all of us, the 4 bands have continued to show up in Indio on April 23rd every year since 2011 to play?