As Kitty's very clear initial posting stated

For example, The Watersons and Young Tradition in 1966, Packie Byrne in 1967 or 1968, Louis Killen in 1965 or 1970, Martin Carthy and Dave
Swarbrick in 1969. And then song guests right through the 1970s up to
the present day. Also ceilidh bands, photos of LNE, etc.