Tomorrow

I will watch a concert tomorrow evening.

I will go to a concert tomorrow evening. <<this is correct
but you are more likely to say: I'm going to a concert tomorrow. As it is an event in the very near future.

I really love classical music. The two violinists are both from Austria.

I am not sure the team is famous or not, but the price of my ticket is not very expensive.

I'm not sure if the duet/musicians/orchestra are famous or not, but my ticket was not very expensive.

I am looking forward to watching this show as I bought this concert ticket 2 months ago.

I am looking forward to going to this show as I bought the concert ticket 2 months ago.

I hope it won't be disappointed.

I hope I won't be disappointed/ I hope it won't be disappointing

Enjoy the day and wish I could learn more the soul of classical music. Good luck!

I hope to enjoy the day and I wish I could learn more about the soul of classical music. Good luck!



I hope you enjoy your concert! 

A couple of notes: we usually attend, go to or go see a concert rather than watch it. You would only really watch a concert if the concert was on TV.
Also, we don't use "team" to talk about a group of musicians. 

I hope some of this will be of help, and that you keep up the good work!