Marriage
And they shall become one flesh
Genesis 2:24
 

One of the most important times in the life of a family is the occasion of a wedding. In witnessing the love of a man and a woman in the Sacrament of Matrimony the community is reminded of the love of Christ before His bride, the Church. The Diocese of Bismarck requires a minimum 9-month period of marriage preparation in advance of the wedding date for all couples planning a Catholic wedding. It is strongly recommended that all couples seeking a Catholic wedding first contact the parish office to meet with Fr. Grafsgaard prior to scheduling a wedding venue and entertainment.
 

Catechism of the Catholic Church, p. 1604

Read more here:
Catechism on Marriage