Dear Mr. Jack,
Long time no see. How's everything going?
I, presenting our school, am very glad to invite you to attend the English Culture Festival held on October 10 in our school. It would be very apprecitated if you can spend two hours to make a speech to introduce the character of English culture for our students during the Festival. I think our students can have a better understanding about the English culture through your speech.
If you agree, please let me know.
Best regards,
Wang Lin
啥意思,帮你写篇作文么?