George Harrison is in the audience during the Beach Boys' 1971 Central Park TV broadcast (probably there to see other artists).
Here's a screencap from the same special the BBs were a part of, showing George talking to Garfunkel:
The B&W still photo above shows Mike and George in the same clothes as the TV special, so it's likely from the same day.
I think the rest of the weird details from that vintage article about George playing with the BBs, etc. are all baloney, typical made-up rumor stuff that was in those types of papers back then.