While looking for information about Stephen Stills & Manassas concerts in 1972 I found this small anouncement:
It was published in the Daily Review of October 26th 1972.
1972-nov-04: Paul Simon, San Francisco, Masonic Auditorium
Paul Simon was in 1973 touring to promote his ‘ There goes rhymin’ Simon’ album….This one is totally new to me! A different Paul Simon? Anyone any ideas?
Paul Simon - 'Time it was...it was' 
I can give you some information about that November, 1972 Paul Simon announcement in San Francisco. It was indeed the same Paul Simon, and it would have been my first Paul Simon concert (my first concert ever, in fact), but when we arrived at the Masonic Auditorium, we found a notice on the door announcing cancellation of the show due to illness of the artist. So my first concert was Paul Simon at the War Memorial Opera House in 1973.
Hello Hellenoe. Thank you for this comment, which is very welcomed. Even Paul Simon can get ill. And I hope the 1973 show was good!