Yes, I missed out many concerts and when I think of it today, it make me ashamed
Until the late 60s, I was living in deep French country side where nothing much was happening. It's only when I did break free in 1970 and hitch-hiked to England and to my very first concert at Plumpton National Jazz & Blues Festival
http://www.ukrockfestivals.com/plumpton-fest-1970.html , then after to the Isle Of Wight.
It was 3 festivals (Biot, Valbonne and Aix en Provence) that got cancelled in the south of France during summer 1970, it was the same "trouble makers" that disrupted the I.O.W. who got them to be cancelled. I did not go to any of them. But of course, I whent to many other concert then after.