Scripture is not irrelevant (not irrevelant, but that is probably a sticky key or the malfunction between your keyboard and chair), but there are no records, only accounts which require faith to believe. This is as God intended.
As for man-made tradition how does the sola scriptura crowd explain enjoying a Christmas Tree and celebrating Christmas on Dec 25th?
I have seen so many definitions from both Protestants and Catholics I can't know exactly what you mean by "sola scriptura crowd" except that it is most likely derogatory.
I imagine any people, including agnostics and athiests, who celebrate Christmas on December 25th do so because it is a "traditional" date to do so.
However, I doubt the "sola scripture crowd" prays to the legendary and fictitional "Saint" Nicholas. Do you?