Do you remember meeting someone before they where famous?

Yes, Styx.

I was 6 months late to having the chance to meet the band Kansas when they played oin Mother’s Worry, a bar in Manhattan, Kansas in the 70s.

I went to High School with this guy

I met Arnold Schwarzenegger a couple times before he made the Conan or Terminator movies, but he was moderately famous then.

When I was in my late teens, I was best man in a wedding where the Maid Of Honor was engaged to this guy . He was there, telling me his big plans for video games. I was drunk, and told him there was no way you could get computers fast enough to do that. Yes, there are times when I just make a fool of myself.

I went to school with Mark Bryan from Hootie and the Blowfish.

I’ve played soccer, in my youth years, with a guy who later would become a national team player.
This was on squares and fields in the neighbourhood, with a whole bunch of friends.
Pretty sure he has a Wikipedia.
He does.

Yes. The Red Hot Chili Peppers in a little bar in Venice Beach CA in the early 80’s

I graduated with Kathy Mattea, a relatively famous country singer.

Yes, musicians/vocalists/songwriters/actors and sports figures.