I was there 1966 or 7. Gandma was ill, but she always sang Dumbarton's Drums, so they rigged a line from her bedside all the way to the stage so she could sing to us.
I was audience, but sitting under Lena's parachute I sang a Scots ballad to a friend, which got me a weekend gig at Cafe Lena, where I startled everyone by including a Beatles ballad in a set.