As one of the seven sacraments of the Catholic Church, the marriage ceremony follows a strict set of rules, but the structure doesn’t differ significantly from a Protestant ceremony.
The main difference is that a traditional ceremony includes a nuptial mass after the exchange of rings, which means the ceremony last about an hour. You can opt for a shorter ceremony that does not include a mass.
After the marriage rite, the priest has everyone make a “sign of peace” by shaking hands with their neighbors. Holy Communion follows, but only for the Roman Catholics among your guests.
Ceremonies must take place in a church or chapel unless permission is received from the vicar-general’s office, and music and readings must typically be religious. Before the wedding, you must announce your intention to wed by publishing banns (wedding announcements) in the church bulletin for three consecutive Sundays.