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 its 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]