Black tie attire is slightly less formal than white tie, but it is more formal than business attire. It is the most common formal dress code for events such as weddings, proms, formal dinners, and theatre.
It's important to treat black tie events with a certain amount of formality, consideration, and respect. Be sure to conduct yourself in a way that reflects these values. Make sure you're moderate with the food and drink as well. Keep it classy so that you can have fond memories of the black tie event.
A creative black tie is best described as attire with a black-tie foundation with room for some creativity and flair. It maintains black tie formality but allows for the use of textures, colors, and accessories to personalize your look.
A black-tie optional dress code gives guests a couple of formal options to choose from. Men are requested to wear a tuxedo, but can opt for a dark suit. Women can choose either a formal evening gown, a shorter cocktail dress, or dressy separates.