Traditions can become established within a relatively short period.
It is traditional to sing a Burns song on New Years Eve- even if you don't understand the words.
Country Music fans have a tradition, coming close to ritual, involving the Elvis Presley compilation "American Trilogy"- which includes a 'traditional' piece of Americana "I Wish I was in Dixie".
People mark the site of road accidents with flowers and ribbons.
The whole point of Folk and Tradition is that it is what people in their communities once did, or currently do.
It is not defined by committees, or lexicographers, lawyers or even Jim Carroll.
Traditional songs are songs which are traditionally performed in the context under discussion, like 'Streets of London', or 'Fields of Athenry', if you are talking about odd little the community which is a folk club.
I've posted before about local variations in party dances like 'Macarena', and 'Saturday Night' and in these, although the music is fixed, the dance moves are being folk processed locally.
There are now traditional ways of doing the dances.
At a Blues Brothers Tribute club, "Stand By Your Man" could be a tradition too! (but only if alternated with "Rawhide".)
They may not be singing Childe ballads, or going within five miles of a folk club, but the folk of Britain are still creating and enjoying their traditions.
Cheers
Dave