There are many examples of black tie parties. Most weddings are considered to be black tie. As well many fundraisers will hold a black tie event. In high school most will have a Prom that will be considered black tie.
Yes and no. You wear a black tie to formal events.
No tie, its invisible... :P
An event that requires formal attire. A tuxedo or black suit and tie for men and formal or cocktail dress for women
One wears a formal suit with white shirt and black tie.
Yes.
Semiformal means a suit and tie for men and a cocktail dress for ladies.
It's a formal event.
If it is a completely formal party I would suggest I tuxedo with a black tie or bow tie. If it is semi casual I would suggest nice pants and a button down shirt w/ collar and a tie.
A formal dinner
No they are not. A black tie dinner is formal, and smoking jackets by their nature are informal.
long gowns for ladies and black tie for men
White bow ties are worn with morning coats of varying colors. Evening wear requires a black coat and black tie. A man's evening wear is meant to keep him from clashing with his partner's gown, so black and white are preferred.