Jules Verne knew what he was doing when he created such crazy and interesting worlds in his books "Around The World In 80 Days" and "20,000 Leagues Under The Sea". His speculations on future technologies were almost prophetic, similar in feel to the way that Da Vinci dreamed and invented.
So what is Steampunk? It's a genre, a design aesthetic and philosophy all rolled into a vintage feeling world where anything can happen. I'd be interested in attending a Steampunk festival. Renaissance enthusiasts shouldn't be the only ones to indulge in their fantasies.