(LENOX, Mass.) – Over a dozen nationally acclaimed writers, including John Berendt, Adam Gopnik, Heidi Julavits, Matthew Pearl, Francine du Plessix Gray, Dani Shapiro, Claire Messud, and poet Mary Jo Salter among them, are slated to participate in Berkshire WordFest 2012, to be held at The Mount, Edith Wharton’s historic estate in Lenox, during the…