First time I remember getting a comic signed in person was some comic convention, maybe Long Beach or something, early 90’s. It was right before Ultraverse had launched. I had Jae Lee sign an issue of Namor. I wasn’t a Namor reader, didn’t know who Jae Lee was, and bought the issue at the show for him to sign because he was there. Still a cool experience.
don’t remember if it was before or after that but one day at the LCS Kris Silver was there promoting Greater Mercury Comics and Silverwolf and had a bunch of comics there. Be hard sold me on the Grips trade when I was like 10 and he signed it and an artist that was with him sketched in it. Pretty sure they signed/sketched an issue of Edge as well. I don’t think the artist was the illustrator for Grips or Edge.
the only other comic I’ve had signed in person was the big Xaime book a few years back. Met my favorite cartoonist.