Have you ever heard of Woodstock. It was a famous music festival in 1969. 
Oh, sure.  the Woodstock arts and Music fair was the highlight of 1969 if you don't count the moon landing.  Over 400,000  people attended.
Yeah, There were 32 performers that performed acts. It was huge at the time.
The hippies who descended on Max Yasgur's farm were drawn by what was billed as "An Aquarian Exposition: 3 Days of Peace & Music"
There was a film about it too. That won an Academy Award in 1970.  And Joni Mitchell made a song about it that was popular also
I saw and heard those. that weekend was the pivotal moment, or nexus, when everything changed from the stoic culture of the 1950's and early 1960's to the psychedelic times and culture of the 1970's.