From a reader:
In my parish the pastor does not know the TLM, but our associate pastor does. Our pastor now desires to preach on a regular basis to the TLM community. Do you know what the rubrics are for a non-celebrant preacher? Should the preacher wear choir dress and sit at a sedilia on the sit of the altar? Should he just show-up and disappear before and after the homily?
Father Homilist should wear his proper choir dress and biretta.
Ideally, Father should should sit in choir.
However, he can come in from the sacristy as well. This could be a good solution if Father is hearing confessions before Mass and even during the first part of Mass.
Mark my words, someone will criticize the priest coming from the sacristy to preach with the image of “cuckoo clock”. To which we patiently respond, even with a talking-hand gesture, “Blah… Blah… Blah…”.