From memory Joan Baez and Don Maclean Kris Kristopherson Glen Campbell and somebody called Ludain Wainright The Third (he was only memorable for how bad he was as well as his bizzonkers name) I think were the "headliners" in Siamsas but The Wolfe Tones and Bagatelle stole those particular shows all those years ago. Think Christy was there too but I might have just imagined that - you could bring in yer own booze.Prodigy stole the show imho.
I remember a rather voluptuous lady who came down from Tipp on a bus with all her pals to an early one, a lot of booze, and my neck covered in love bites. Happy days