Today is the great concert big bangbig Big Bang concert

I changed "great" to "big" here because it is much more typical for people (at least in the USA) to say things like, "Today is the big event," instead of "Today is the great event."

tToday, nNovember 14, to hours at 8:00 pm, will begin the concert of big bang the Big Bang concert will begin. all dieEveryone is dying to go to this great concert. mMany people came from other countries to see them.

One additional correction: I didn't make this change in the text because you have different options available, but it is better to say, "Many people came from other countries to see it" (instead of "to see them"), since you were talking about the concert in the previous sentences. If you do want to switch to talking about the band instead of the concert itself, then it is best to indicate that you have intentionally done that by identifying the band explicitly (by saying something like, "Many people came from other countries to see the band") before switching pronouns.

Here are the asian fashion = ?? (I didn't correct this sentence because I don't know exactly what you are trying to say here.)

Good work! I hope my corrections help!