Make the Syrup
In a large jar with a tight-fitting lid, vigorously shake sugar and water until the sugar dissolves, about 1 minute. Pour the syrup into a pitcher.
Mix the Drink
Add tequila, orange liqueur and 1 cup lime juice to the pitcher; stir.
Rim the Glass
Pour 2 tbsp. lime juice on a plate. Spread salt on another plate. Dip the rims of 8 glasses into the lime juice, then into the salt.
Fill the glasses with ice, then add the margarita. Garnish with lime wedges.