OR THE FINAL SUNDAYS after Pentecost, something funky happens in the Extraordinary Form. The propers are repeated over and over, but the readings are taken from various Sundays after Epiphany, depending on how many “extra” Sundays occur. In the CAMPION MISSAL, there’s an explanation chart, and then every possible Sunday is fully written out (even extremely rare ones) making things easy on the congregation.
Here’s that chart, with the key sentence highlighted in yellow:
Be careful this year.
25 October is Christ the King Sunday (replacing the 22nd Sunday after Pentecost). The next Sunday (November 1st) is the feast of All Saints. Then, 8-Nov, 15-Nov, and 22-Nov use the same propers. Your Schola Cantorum will probably get pretty good at these…
For the record, here’s what Fr. Adrian Fortescue has to say about “Sundays after Trinity” vs. “Sundays after Pentecost” :