write a email inviting me to a meeting that i must attend in

Invitative Letter
Dear Regional Sales Managers：
The purpose of this letter is to formally invite you, on behalf of the Board of Directors, to take part the meeting in our company.
It will be held at the Li Jiang Hotel, on march,7, 2012.
This seminar is very important so please be on time. We are looking forword to your attending the party. Thank you for your cooperation!
Yours sincerely,
Wang Hongwei