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 from [size] to [size]. now its 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]