I get wonderful local grape juices at my market at the same stand where I buy my grapes. I especially like white grape juice for this recipe but anything will work! For vodka, I love Ciroc because it matches the grape flavor profile of the drink but love the "classics" like Stoli just as much.
Put half of the red grapes and half of the white grapes in the freezer, for garnish. Put the remaining grapes in a large bowl and "smash" them with a whisk (or fingers).
Add the smashed grape to a large pitcher and pour in the grape juice and honey. Stir in about 16 ounces of vodka. Fill glasses about 1/2 full with the grape juice mixture and top with a splash of seltzer. Drop and few frozen grapes into each glass for a festive garnish that doubles as an ice cube!