I'd probably attend and listen to anything these people would talk about: Alan Kay, Don Knuth, Feynman, Oppenheimer, Teller, Von Braun, Henry Ford, Edison, Telsa, Edwin "Major" Armstrong (FM), Charlie Munger, Kary Mullis, Ray Kurzweil, Alfred Loomis, Turing, the transistor boys (Shockley, Bardeen, Brattain), Jim Williams (Linear Technology), Robert Pease (formerly National Semi), Bob Widlar (National Semi), maybe even Wozniak.

I would not bother to attend a talk by any politician or Steve Jobs.