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Fair Grinds Coffeehouse is a staple in New Orleans' Bayou St. John neighborhood, couched on a street that runs catty-corner to leafy, picturesque Esplanade Avenue. The vibe of the place is both funky and conscientious — you're more likely to hear Leonard Cohen on the P.A. than, say, Dr. John as you sip a sustainably harvested cup — but a month from now, the shop's neighborhood will be overrun with several thousand revelers and music fans as they descend on the nearby Fairgrounds for the annual New Orleans Jazz and Heritage Festival.…