In this day and age wedding banns are not very useful. Their purpose was to make sure that everyone knew a marriage was supposed to take place and if anyone knew of any reason why the marriage should not take place they were to immediately contact the Pastor.
Today where there is so much mobility, proclaiming banns in a parish often only yields a puzzled look on faces. We last published banns about 8 years ago, as the parish of Baptism of the groom I think, at the request of the Parish where the couple was getting married. No one in our parish had ever heard of the person or his family.
Whoever they were they had not lived in the area for any length of time. That’s not unusual in a parish where only about 10% of the names listed in the register of Baptism for the first 10 years of our existence ('58-'68) are known today. It reflects the transient nature of our population in those early years.