Taco Salad for a Large Crowd

In a Dutch oven over medium heat, cook beef with 1 envelope plus 2 tablespoons taco seasoning until no longer pink; drain. , In a very large serving bowl, combine the lettuce, chips, tomatoes, beans, olives, cheese, onion, chilies and beef mixture., In a small bowl, combine the salad dressing, salsa, sugar and remaining taco seasoning; pour over salad and toss to coat.