Dear Sir/Madam，
[Organization] would very much like to have someone from your company speak at our conference on [topic].
As you may be aware， the mission of our association is promotion. Many of our members are interested in the achievements your company has made.
Enclosed is our preliminary schedule for the conference that will be reviewed in the coming weeks. I'll call you [date] to see who from your company would be willing to speak to us. I can assure you that we'll make everything as convenient as possible for the speaker.
Sincerely yours，
[name]
[title
Dear Sir/Madam，
We would like to invite you to an exclusive presentation of our new [product].
The presentation will take place at [location]， at [time] on [date]. There will also be a reception at [time]. We hope you and your colleagues will be able to attend.
[company] is a leading producer of high-quality [product]. As you know， recent technological advances have become increasingly affordable to the public. Our new models offer superb quality and sophistication with economy， and their new features give them distinct advantages over similar products from other manufacturers.
We look forward to seeing you on [date]. Just call our office at [phone number] and we will be glad to secure a place for you.
Sincerely yours，
[name]
[title]
Dear Sir/Madam，
On [date]， we will host an evening of celebration in honor of the retirement of [name]， President of [company]. You are cordially invited to attend the celebration at [hotel]， [location]， on [date] from [time] to [time].
[name] has been the President of [company] since [year]. During this period， [company] expanded its business greatly. Now it's our opportunity to thank him for his years of exemplary leadership and wish him well for a happy retirement. Please join us in saying good-bye to [name].
See you on [date].
Yours sincerely
[name]
[title]