"Portcullis Folk Club | Marlin Nursery School | 1 Park View Road | presents | John Martyn | Mike Deavin | Nick Webb Bob & Jezz | Bob McNiff | on Saturday May 13th at 7.15 p.m. | 40p at the door only"
The year was 1972 and the town this concert took place was Berkhamsted. It might well have been organized by Nick Webb (1954–1998), who apparently was "captivated by the folk musicians of the 1960s, particularly John Martyn, and began playing and performing as a teenager and also ran The Portcullis Club in Berkhamsted".

sitenotes:
Poster made public by Billy-Ray Valentine.