My real name is Abigail, but everyone calls me Abby. My fiancé is Michael, and everyone calls him Mike. Would it be appropriate to say "Abby and Mike are tying the knot" on our save the date magnet? I intend use our full names for the formal invitations. More so for me than my fiancé, but no one ever refers to me as Abigail. Save the dates seem more informal, so I am wondering if this is acceptable?