Hello, I am Little MING, the President of XX High School Student Council.
Our school will hold an English speech contest with the theme "Human and Nature"
The purpose of me writing this letter is to invite you to be the judge of this event if you are available.
The contest will be held on Oct. 10th from 2 p.m. to 5 p.m. in Classroom XXX.
There will be 10 students attending this annual event.
It would be deeply appreciated if you could come and help us.
If you have any question, please contact me. My number is XXXXX
Thank you for your time.
Love,
Little MING
标准的北美英语 没用翻译器 绝对包你满分~~ I am happy to help!^_^