Pour boiling water over tea bags; stir in sugar and mint. Cover and steep 20 minutes. Discard tea bags and mint; cool completely (about 1 hour).
Stir together tequila, next 2 ingredients, and tea in a pitcher. Pour over crushed ice in 8 (10-oz.) glasses; top with a splash of club soda.
Note: We tested with Celestial Seasonings Red Zinger Herbal Tea.