There's one in Tucson next Sunday at 2:00.  You'll find it listed as "Tucson's 1st Flash Mob event".

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From: "John Sasser" <sassmastergeneral@gmail.com> 

Is there a WWFM World Wide Flash Mob Caching Event for 2007 in AZ?

I heard about them on my Geocaching podcast I listen to be Don't know where the closest one is.