I am not a writer, although I know a few. The most interesting place I've encountered, and a place that almost inspired me to write myself, was the one and only sci-fi convention I ever attended. Note that it wasn't really a convention focused on TV/movie/comics fandom, although a few of those creators were on panels too. Mostly it was sci-fi and fantasy novelists discussing industry topics in panels, taking questions and hobnobbing with attendees between sessions. I'd definitely recommend trying to find a convention with a more writer-y focus, especially if you are interested in genre fiction.