In our diocese there are the following rules for Sunday Celebration In The Absence of a Priest requirements (SCAP): If a deacon is available, he may conduct the service and preach after the gospel. Next, a religious (Nun, Brother) or an Instituted Alcolyte-no preaching. Next a properly trained lay person-no preaching
Daily communion services have the same requirement, but usually are done by a trained lay person.
God Bless
Deacon Tony
Dont’ look for a sign…Be a sign!