This is dies non, and no one is obliged or expected to attend.
Well, even talk about Richenda would make shorter that dies non.
Days of grace (dies non) are in existence practically among English-speaking peoples only.
As to the disciples, this "high day" is a dies non to them, for the curtain of a deep silence hides them from our view.
A beautiful clear morning, but this was nevertheless a dies non to us, owing to the impassable state of the surface of the earth.
But for men whose voyaging depended on sails, it was, as the lawyers say, a dies non.
Would I be so kind as to regard this as a dies non in the rota of our pleasant gatherings?