Dear sir/madam,
  On [date], pany]. You are cordially invited to att the celebration at [hotel], [location], on [date]  to p.m.
  [name] has been the President of [company] since [year]. During this period, [company] expanded its business  to . Noeone  your company speak at our conference on [topic].
  As you may be aote . Many of our members are interested in the achievements your company has made in .
  Enclosed is our preliminary schedule for the conference your company pany] is a leading producer of high-quality . As you y, and their ne 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,