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How do cool parents celebrate Earth Day with their kids? With live performances by very famous musicians, edible art projects, fossil digs, manicures and DJ lessons on the beach in L.A., as was the case at the book launch of Last Night I Swam With A Mermaid yesterday at the Annenberg Community Beach House where hip moms and dads like Julie Bowen, Jason Bateman, Johnny Knoxville and others stepped out for the family friendly occasion.