For a large group, you can make a pitcher of limoncello spritz. Chill all of the individual ingredients (unopened). Combine the ingredients in a large pitcher just before you plan to serve the drinks so the mixture doesn’t get diluted or lose its carbonation.  Don’t add ice to the pitcher. Instead, serve ice in an ice bucket alongside the pitcher and add the ice cubes directly to the wine glasses as the cocktail is served. Ratios are the same, but in larger quantities when making a whole pitcher:  3 parts prosecco, 2 parts limoncello, 1 part soda water. 750 ml bottle of Prosecco, 16 ounces of Limoncello, and 8 ounces of club soda.