I think it was the early 1970's, Toronto, Canada.
I was just a kid, and had heard that some guy was performing magic at a local rock and roll bar not far from the Magic Shop where I was working part-time.
I was underage, but sneaked in to one of the shows. There were about 30 people in the dimly lit place, at tables around a small platform stage. On stage was Steve Martin.
I'd seen him on The Carson Show as a comedian, so I was surprised to see him in this little back-room dive performing for such a small crowd.
He did a 30 minute stage set of comedy and banjo playing, and the audience loved it. No one wanted to leave, so he just kept going. He sat on the edge of the stage and talked to the audience, did jokes, made balloon animals, tried to pick up girls using close-up magic tricks (I remember one young lady's ring vanishing and re-appearing in her glass of wine). He went on for 2 and a half hours. He followed girls into the ladies' room and came out screaming, saying that he saw things in there that no man should ever see.
It was a great and memorable evening for me. His timing was fantastic, and the material all looked spontaneous. People would ask him again to make balloon animals, and he'd say that he'd done that earlier, and the same people were still there. People asked him to do it again, anyway. He offered a compromise -- He would make balloon animals, but this time he wouldn't blow up the balloons! He proceeded to do so, tying un-inflated balloons into knots, saying that one was a puppy dog, this one was a birth-control device, etc. Very funny, very personable, and 3 feet away from me!
He's been back to Toronto many times since, playing the largest stadium here at one point, making films here, etc. He visits the local magic shop when he's in town.