I remember this well. I was at Lincoln Art College and the organisers had sent some posters for the college and 4 free tickets for our social secretary. But term had finished and everyone had gone home - just me and my friend Elaine tidying up our work. So we had 2 tickets each. I was working in a bar all summer and asked the boss for that Saturday off - he said no so I gave in my notice. Anyway he had to beg me to come back!!
I remember the Byrds being fantastic and sitting under the stars listening to James Taylor.