Here follows a curious item offered by “Beachcomber,” the pen name of humorist J. B. Morton (1893-1979), from the March 11, 1931 edition of The Daily Express:
Dathlu Cwyl Dewi
Dan Nawdd
Cymdeithas Drama Dyffreyn Madog Yng
Ngwesly Brenhinol y Sportsman
Porthmadog
Nos Waner, Chwefror, 27 Ain, 1931.
The above, printed on green in a square card, has reached me without a word of warning or explanation.
I am replying with the one expressive word, Ysgrifenyddion.
Perhaps Mr. Arthur Machen is at the back of it all.
The card’s text can be translated as:
Celebrating David’s Feast
Sponsored
Dyffryn Madog Yng Drama Society
Royal Sportsman’s Mansion
Porthmadog
Friday evening, February, 27th, 1931.
There is much in this message that led Morton to reasonably suggest Machen may have been the originator. However, his “expressive word” seems to be nonsensical: secretaries. (If anyone can shed more light on that, please feel free to comment.)
A week later, March 17th, Morton returns to the subject with the following blurb:
Oh, the agony of it!
Back to Machen Miscellanea
darklybrightpress.com 
Alas, none the wiser about “Ysgrifenyddion” after reading the Wikipedia articles “Beachcomber (pen name)” and “J.B. Morton”, though glad to have read both. “After the war, Morton wrote a novel, The Barber of Putney, based on his experience of life in the trenches” is tantalizing, but I can’t quickly find any scans or audiobooks of it online.
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