when can i wear a black tie??

[sunnypoker]

ok so i'm talking about a tie which is black, not talking about the "black tie" type of event.

is a black tie strictly reserved for "black tie" events only?

or can black ties be worn in any other occasions with a suit if you want?

for example, going to work, or as for me coming in a couple of days, graduation ceremony (daytime). is it strictly wrong to wear a black tie?