Agreed. Which is why I booked a flight to Salt Lake when I learned about it. Several years ago I passed on seeing Neil Armstrong speak at NASA/Ames. A few months later he died and I never got to see him in person. I learned my lesson and seldom pass up an opportunity to listen to smart people riff on topics which interest them.
Mhmm added to calendar. What a solid lineup, good lord.
EDIT: you only need to RSVP if you're attending in person. First day is 10-5, second day is 10-12.