A possible version:
An Unforgettable Day
I’ll never forget June 11th, 2012.
It was a sunny day. On the way to school, my friend did something rude to me. It made me sad. What’s worse, I got a “C” in my favorite subject.
After school, I went home unhappily. It was dark in the room. Suddenly the lights were on, and I heard the song “Happy birthday”. I was surprised to see many people and a big cake. “Oh, it’s my birthday.” I was so excited and happy. It was my first time to have a birthday party.
I’ll never forget that day.