Once we start washing women’s feet during the Maundy Thursday Mass we are implying that there were women present at the Last Supper when Christ instituted the priesthood, (and that they were treated on a par with the men there). That gives oxygen to those who are already arguing that women were present at the Last Supper, and who use this to justify false notions of female ordination.
Perhaps you feel that the implication is being made. So let’s look at that.
Why were the Gospels written? Hint: it was not because the writers had the mindset of a 20th century historian; they were not writing to give a blow-by-blow articulation of who was there and who was not.
The Gospel accounts of the Last Supper tell us both of the institution of the Eucharist, and the institution of the new priesthood. As such, it focuses on the 12 Apostles.
All I can find at the moment is my copy of the Jerusalme Bible; John 13, vss 4-5 “and he got up from table, removed his oputer garment and, taking a towel, wrapped it around his waist; he then poured water into a basing and began to wash the disciples feet and to wipe them with a towel he was wearing.”
The note in that quotes says “The dress and duty are those of a slave.”
2 comments: the word “disciples” is used, not Apostles, or The 12. And the image of the one who was Rabbi, Teacher, and as the one acknowledged as Lord and Christ (Anointed) becoming as a slave is indicative that the message of washing feet is that of humility, charity and service. Not priesthood per se.
Mark is interesting; Luke identifies the two who went to prepare the room as Peter and John; Mark only as 2 disciples, and then says “He arrived with the Twelve” (Mark 14, 17). Further, He responds to their question of who will betray: "It is one of the Twelve, one who is dipping into the same dish with me. (vs. 20). If only the Twelve were there, then it seems an awkward statement - why not just “one of you”? Stating the Twelve would seem to imply others were present.
Matthew does not note that two disciples went to prepare the room, but only “the disciples”. However in 26, 20 Matthew refers to the twelve disciples as those at the table.
The short of it is that the scripture passages could be read as only the Apostles present, or as others present. As the focus is on Christ and the Apostles, there was no particular need for any of the writers to note others present; and they are written in a way that it is possible that others were present; it is clear the 12 were.
But the assumption that no one else being mentioned means that no one else was there, is looking at the scriptures as a historical reporting of all the facts. As others possibly being present that night is irrelevant to what the writers were conveying, there was no need for them to report.
It is entirely possible that only the 12 were; but the scriptures were not focused on that matter, and so we conjecture.