I really love to go concert of my favorite singer.

-> I really love to go to a concert of my favorite singer.

My favorite singer is psy.

-> My favorite singer is Psy.

Do you know kangnam style?

-> Do you know Kangnam Style?

He is an awesome singer in the world. (Good sentence)

He held concert once every years in Olympic stadium.

-> He holds a concert once every years in Olympic Stadium.

i always go his concert with my friend in the end of year.

-> I always go his concert with my friend at the end of the year.

His concert is so excited and interesting.

-> His concert is so exciting and interesting.

Psy concert is so popular.

-> Psy's concert is so popular.

I have to book a ticket in advance. (Good sentence)

Before I enter the concert, I have to wear casually to rock out at his concert. So I bought some water, too.

-> Before I enter the concert hall, I have to wear casual clothes to rock out at his concert and I bought some water too.

After the show, my friend and I talk about the concert and we take a photo in front of the concert hall in memory.

-> After the show, my friend and I talked about the concert and we took a photo in front of the concert hall for a souvenir.