Formal Invitation Letter Sample 2016-08-16 | Lion Pick out the best formal invitation letter sample from our wide variety of printable templates you can freely customize to match any party theme. Also read: Joint Graduation Party Invitations Related posts:Psychedelic Birthday Party InvitationsOwl Boy Baby Shower InvitationsBeach Wedding InvitationsHigh Heels Invitations PrintableOffice Luncheon InvitationLeopard Baby Shower Invitations