I don't know when I first came across "Tunes Sessions". By that I mean those sessions where people with intruments gather, usually in pubs, and play jigs, reels, hornpipes, polkas and such like.

I certainly remember them at Whitby Folk Festival 1972 and guess they were well established by then.

The Album "Paddy in the Smoke"

Here

shows Irish music being played in a Pub Session format.

Is their any evidence for English tune session of a similar kind before the 1960s Revival?

Best wishes
L in C#