The atmosphere at the Smith Center is incomparable atmosphere and acoustics to any other live performance venue in town. Many people who visit on a Friday or Saturday evening will be dressed up in suit or dress. I don't think Vegas will ever enforce a dress code and people who show up in casual jeans and a tshirt detract from the ambiance. There are multiple floors and at least 2 bars on every floor to get cocktails and refreshments. Even if your tickets are on the first floor, the Mezzanine (second floor) waiting area is nice and open and often sports shorter lines for the bars and snackbar plus has access to the outdoor balcony facing Downtown Las Vegas. **But, beware the Smith Center isn't just there to look pretty. When purchasing drinks they automatically upsell you the souvenier $3 reusable plastic cup. Which, if you bring it back your drinks are $3 (Because when you think theatre, you think "I need to pack my reusable cup", right?). Then they will also suggest a double. Just have an idea of what you want so you don't come away from the bar with a $20 drink. They also have regular solo cups which they have let me bring in to Reynolds Hall without issue.