Like, a Q&A where your characters answer questions? I've done that a couple times before, and it was a generally pleasant experience.
For any kind of Q&A, though, I would advise you to keep your expectations low. I'm not saying "fans are stupid" or anything, it's just that fans aren't you. They'll rarely ask the deep questions that you'd really like to answer, not unless you're super-famous and have 100s of people theorizing about your work on a daily basis.
The best moments are when someone asks you an interesting question that you never even saw coming; that's what I live for~