Community Servings held its annual “Pie Day” celebration Tuesday, which involved CEO David Waters serving slices of a 5-foot pie to passersby at the Pru. (The mammoth pastry was donated by Montilio’s Bakery.) The event hyped Community Servings’ annual Thanksgiving pie sale, which benefits the agency’s food and nutrition programs for people living with critical and chronic illnesses. . . . Comedian Kathy Griffin dined with a few friends at Strega Waterfront.