National Tequila Day is Friday, and if you’re traveling through Denver International Airport, you can celebrate. Que Bueno! Mexican Grille at DIA will be offering $5 Espolon Tequila Mules to commemorate the day. Plus, if guests purchase two mules, they will get to keep the copper mug. Operated by Denver-based Mission Yogurt, Inc., Que Bueno! is located in Terminal B, and serves fresh Mexican fare.