Right now a poster for sale on eBay for this event:
The concert started at the end of the 2nd of May and ran into early hours of the 3rd. As mentioned on the poster “No Television”, luckily it was recorded for Dutch radio and broadcasted 2 weeks later by VARA Radio.
There was a lot of discussion about the prices of tickets…the poster is now for sale for 1250US$.
Paul Simon - 'Time it was...it was' 
When I was 17 years old I visited this Simon and Garfunkel in the Concerthall in Amsterdam.
I had to buy a ticket at the Liedschestraat in Amsterdam. Price in these days was 20 Dutch goulders.
I went to the Concerthall by bike. Reason: it was in the neigborhood. The concert started about 0.0 A.M..
The Simon and Garfunkel concert ended about 2.30 in the morning of the 3th of May 1970.
Fortunately I found a copy of this Simon and Garfunkel concert.
Pls. check out this link given by Mixcoud:
Kind regards from the Netherlands. I hope all Simon and Garfunkel will enjoy listening this tape.
Kind regards from the Netherlands. Europe. I`m currently living in a city called Zoetermeer.