I've had a bunch of brushes because, a long time ago, I worked security at the Saratoga Performing Arts Center in upstate NY. Not going to drop a lot of names (Liberace was a nice guy with a great wardrobe) but this guy was referenced in another thread...
I think it was 1971 and Bobby Sherman's back-up band was also the opening act. A five piece - guitar, bass, drums, sax, and Hammond organ - doing all Stax/Volt and Motown covers for about forty-five minutes. They were outstanding. They took a break and I looked out to the crowd from behind the curtain stage right. It's a Saturday afternoon show for about three thousand teenage girls with some parents. You could smell the hormones. The band gets back up and vamping and the MC is preparing the crowd for the star. Bobby stood behind the curtain. He's about five foot five in a white jump suit, a Beatle-like mop top and shaking. He knows what's coming.
He bends over. Vomits profusely into a trash can behind the curtain. "Ladies and gentlemen - BOBBY SHERMAN!!!"
He runs out and does about forty minutes - "Julie, Julie, Julie, Do You Love Me?" The band is great. He's good. The girls are screaming and squishy.