Grateful if you could help polish this letter.
Dear Mr X,
I am writing to invite you and your colleague(s) (or I am writing to extend our invitation to colleagues(s) of your company) to attend the captioned (or our upcoming seminar on “International Benchmarks”) jointly organized by the ABC Company and XYZ Company to be held from 19 to 21 January 2009 in Shenzhen. Mr. B Evans, Director, Brooks Department, U.S.A. has kindly agreed to be the speaker of the seminar. (or We are delighted to have Mr B Evans, Director, Brooks Department, U.S.A. to conduct the seminar.) Details of the seminar are attached.
Should you require any further information, please feel free to contact Miss Ily, Secretary of the Organizing Committee at (852)xxxx (EMAIL REMOVED - Send PM to This User Instead).
I look forward to your favourable response and wish to take this opportunity to wish you a Merry Christmas. (Is it a bit early to mention Christmas now? Or With best regards and I look forward to your favourable reply.)
Thanks a lot!