Answer:
Dear (Your friend's name),
Hope you are fine and enjoying your life with full of energy. Its been very long since we met. I'm missing you as well and there is a very amazing thing to tell you. Actually, our school is going to organize an event in which every student would be given a chance to show their talent. I'm really excited about this event because I'm going to participate in this. Many people said that I'm able to participate. I will be participating on the behalf of my singing. I can't say whether I'm gonna win or not because there are many students who can sing amazingly, still I've decided to participate because I remember that once you told me that we should not participate in something in order to win but to inspire others to participate and to show their talent. I was a little afraid of participating but then I remembered this and now I'm going ahead to participate in this event, So because of this It was really important to tell you about this thing and Thank you for inspiring me.
Your's Lovingly,
(Your name)