we sang everything unaccompanied as neither organist were there. Don't know if that was deliberate but that is the way it was.
It could be when the Mass setting was chosen that nobody knew there would not be an organist around. We all sang straight through to the Blessed and I remember thinking it worked quite well. It is a setting we use anyway so they also know how it goes when accompanied.
As to
prestigious place
I say that first and foremost it is a church, a parish church with regulars who are used to standing back on big occasions and even waiting on the visitors but for the vast majority of the time it is our church. On that Sunday, that was us singing, there were a few visitors, as always, but it was us singing what we knew and enjoying it.
This Sunday just gone, we had the second organist playing the same Mass setting and he always messes up that four bar section so I and my friend made sure we counted the 4 bars and then we came back in with the Blessed and others followed.
I wish we could have more unaccompanied Masses and will say so when we get back into the swing of things. I would go further and say every now and then we should sing without the notes!!! Actually learn a piece and sing it without any heads being buried in the copies.