I've met quite few.
I'll start with an older era.
My uncle (died at the age of 92 a few years ago) used to the pianist for Harry James big band. His house in the Studio City hills, was a mecca for top musicians when they were in LA. Some of the younger people on this forum may not know all these names, but anyone with any passing knowledge of music should know some of them.
Louie Belson, Buddy Rich, Tony Bennett, Rosemary Cloony, Steve Allen, and others were regular visitors. I didn't just meet these people, but hung out with them, and listened to their stories.
This would have been in the late 60's when I wasn't even in my teens yet. But I knew enough to understand the talent of these people, even though they might have not been my style at the time.
But all through the rest of my life, I met and hung out with even more.
I went to Keith Emerson's last birthday party, the year before he killed himself, but met him on numerous occasions before.
I hung out with Allan Holdsworth many times. Not exactly someone that could be considered a 'celebrity' for the average person, but ask any living guitarist on the planet who he was...
Met and talked to Peter Gabriel on 3 occasions.
Met and gave car ride to a drunk (before he got clean), John Wetton (King Crimson vocalist, bass player) in 2000.
I've met quite a few more, world class (jazz, prog and classical) musicians, but because the world does not seem to reward actual musical skill with celebrity, and uses other (crappy) metrics instead, I will not list them.