"Q. Our granddaughter was recently married and we were disappointed that the banns were not read. Has there been a change, or are they read only if the family asks? (Missouri)

A. Formerly Catholic marriages were announced beforehand (banns) with the intention that anyone aware of an impediment to the marriage would make that fact known. In today's mobile population such announcements are hardly useful. Also, premarital testimonies of families and friends are more extensive than they used to be.

Present Church law does not require banns. Bishops' conferences may prescribe them (Canon 1067), but American bishops have not done so." - Fr. John Dietzen's column.

Banns of marriage - Wiki