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 to p.m.
[name] has been the president of [company] since [year]. during this period, [company] expanded its business from to . 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 to say good-bye to [name].
see you on [date].
yours sincerely
[name]
[title]