The clue really is in the title of the event: "Folk n Roots".

All of the artists appearing fall into the category or "Roots music".

The inclusion of the word "Folk" is not necessarily relevant to all of the artists appearing at the event, but it certainly is for Beggar's Bridge, who play songs which tell stories of people, places and events relevant to this part of the world. That's folk music. I accept that, while their music sounds just like traditional music and also fulfils that story telling criteria, the fact that it hasn't been handed down through generations from possibly unknown composers means it is is possible to argue that it isn't "traditional".

Of course, the event title doesn't even mention the word "Traditional", so there was actually no real need to ask the question.

You say you "stirred things up - intentionally", but I don't believe you; you simply saw someone promoting an event using the F-word and decided to wade in with no justification whatsoever, and made yourself look a pratt.