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Attention, summer-lovers: picnic season has officially arrived. While the traditional gingham-blanketed al fresco meal depicted in Impressionist paintings may have given way to sitting in a circle of bikes at your local city park, enjoying a Chipotle burrito and sipping wine from a styrofoam cup, there are a few core tenets of picnicking that will never change — warm temperatures, good friends, imbibing in close proximity to the ground, and of course, a cute outfit.