Dearsir/madam:
On[date],wewillhostaneveningofcelebrationinhonoroftheretirementof[name],Presidentof[company].Youarecordiallyinvitedtoattendthecelebrationat[hotel],[location],on[date]fromtop.m.
[name]hasbeenthePresidentof[company]since[year].Duringthisperiod,[company]expandeditsbusinessfromto.Nowit'souropportunitytothankhimforhisyearsofexemplaryleadershipandwishhimwellforahappyretirement.PleasejoinustosayGood-byeto[name].
Seeyouon[date].
Yourssincerely
[name]