Smart but casual. usually office wear
There is no dress code. Common sense says dress smart casual.
Casual dress code means you can wear anything you wish. i.e. jeans and t-shirt, training shoes whatever you wish. It means you do not have to wear a jacket or tie or smart clothing.
Smart casual attire would include khaki dress pants paired with a nice sweater or a blouse that buttons and includes a collar. Smart casual might include dress pants with a blazer and low heels or even a casual dress.
It would depend on what sort of concert it is but smart casual is usually the norm
The dress code for Creek Wood High School in Charlotte Tennessee is smart casual.
dress casual but fancy
i would wear, jeans and a nice top with a blazer and heels to dress it up, that'd be nice:-)