Julius Schwartz was another of the guests, and as I was slowly rebuilding my collection after a Navy stint, I had few Schwartz edited comics, only more recent stuff. I ended up bringing a copy of Ambush Bug Nothing Special #1 (1992), edited by and partially-starring Julius Schwartz.
In the story, Ambush Bug aspires to inherit the title of DC's goodwill ambassador from Julie, but the only thing standing in way is the seemingly immortal Schwartz. Ambush Bug travels through time and space only to find the editor waiting for him in various wacky guises. The Bug jumps to the Legion of Superhereroes' era only to find:
Bug jumps further ahead in time but cannot escape the omnipresent Schwartz. So I met Mister Schwartz, and after the customary star-struck babbling, showed him the book. He got a good laugh out of it, showed it to his nonplussed wife, and talked awhile about his time editing the Ambush Bug books. I had him autograph a page where he directly addresses the readers and tells them the truth about comics, which has only gotten truer:
Of course, he ultimately proved to be all too mortal after all, but I'm glad I had a chance to meet an industry legend.