I actually did something similar at Wonder-Con: I was listening to a panel discussion (Mike Mignola, Chris Farnesworth, Amber Benson--I confess, I mostly went for Mignola!) on monsters in their works. I don't read much vamp fiction, but when Farnesworth started talking about his character, I was so interested that I got out my Kindle and bought the book right away! (Totally worth it, too!)
The convention staff would love a story like that...that is, of course, their hope when they invite authors!
Pizza, fan base expansion, and food subsidy in one go!
Does this count as "I'll Food for Work"?