Meet? No... see? walk past? Yes.
Saw Justin Timberlake (there was a semi "secret" recording studio in my neighborhood), that was kind of out of the way, but as a teen you kind of go out of the way to get away from people too, and Timberlake was there (don't know why, don't know if he recorded anything or just visiting with someone or what).
Dave Chappelle, was in a fancy hotel for a close cousin wedding, when another cousin noticed him and went over and got an autograph. To be honest, I didn't think it was him (because you just don't randomly run into famous people (I thought) and why would Chappelle be there?) ... turned on the news later that night, only to hear, Chappelle was in the city for some event. So I now think it was him?