Put the oranges, lemons, limes, and mint in a large plastic container. Pour the agave nectar over the fruit. Add the tequila and mix gently. Add the white wine, cover, and let the mixture marinate in the refrigerator for a few hours.
Put the fruit mixture in a large drink dispenser or divide among 2 large pitchers. Top off with the sparkling wine and the lemon-lime soda.
Photo: Scott Phillips