From a reader:
Canon 902 states that “Unless the welfare of the Christian faithful
requires or suggests otherwise, priests can concelebrate the Eucharist. They are completely free to celebrate the Eucharist individually, however, but not while a concelebration is taking place in the same church or oratory.”
So how is this to apply in Traditional Simultaneous Masses?
Simultaneous Masses (EF or OF) seem to be licit under can. 902, as long as one of the simultaneous Masses is not being concelebrated.
Since concelebration is pretty unlikely in the Extraordinary Form, let a hundred simultaneous TLMs blossom! Let a hundred priests discourse over Mystic Monk Coffee afterwards! (Fathers, refresh your coffee supply now!)
I’m not sure how this “no simultaneous Mass where there is a concelebration” is squared with the common practice in, particularly, St. Peter’s Basilica, in Rome. In St. Peter’s and other pilgrimage places, individual priests are celebrate Mass at one altar simultaneously as another Mass is being concelebrated at the next altar over. There may be some sort of a dispensation or particular law governing St. Peter’s, St. Mary Major, etc.. Otherwise, those in charge are just bowing to the obvious and ignoring a silly canon.
What I strongly object to is any pressure on priests to concelebrate or any fisheye if they choose not to. Sometimes even priests who should know better get obnoxious about this point.
Concelebration should be safe, legal and rare.
Let there be Masses! Masses, I say, many and simultaneous!