On the 10th of September 2011 many musicians got together in Bill Carrolls bar in Thomastown, Kilkenny to commemorate John's birthday. It turned out to be quite a memorable weekend. Fans were moved to be able to hear John's original band playing again. The next year a more ambitious effort was made to establish a tradition but unfortunately this did not succeed.
Original cover material for the Heaven And Earth album that was not used. This was designed by Michael Page but eventually alternative artwork by Reginald Hastings was chosen.
Adrian sent me the picture of this poster of the Swansea concert of Sunday 6th August 1995. "Unfortunately I stored it in the shed many years ago so it's a bit tatty. But it still shows the full band list for all four days."
Poster for a charity gig for the Royal National Lifeboat Institution. John had to skip this show because of a missed plane, but gave a concert one day later. There is some footage on YouTube of the occasion.
To my knowledge the Isle of Skye Music Festival had three incarnations.
First traces point to 1985 and 1986 and John performed on the former occasion, as this poster proves.
There is a forum post by Jim Robertson indicating that John Martyn shared the stage with Nazareth (this could have been 1984 or more likely 28 June 1986), but on the 1986 poster John's name is absent so that remains unconfirmed.
A rare poster of a one time festival. 25 August 1979, Portrush, Northern Ireland saw the Causeway Coast Music Festival. John played the Saturday night.
Tom Paxton deserves praise for keeping it.