Combine the base ingredients: In a large pitcher or punch bowl, add the tequila, apple cider, cranberry juice, fresh lime juice, and agave nectar.

Stir well: Use a long bar spoon to stir thoroughly until the agave nectar is completely dissolved and integrated into the juices.

Chill: Cover the pitcher and refrigerate for at least 1 hour (or up to 24 hours in advance) so the flavors meld and the mixture is thoroughly chilled.

Add ice and bubbles: Right before your guests arrive, add a large ice ring or large ice cubes to the pitcher. Slowly pour in the chilled Prosecco and give it one gentle stir to combine without losing carbonation.

Garnish and serve: Float fresh cranberries, apple slices, lime wheels, and rosemary sprigs on top. Ladle or pour into ice-filled glasses and serve immediately.