I got the invite for SF, and I'd love to drop in and hear the presentation on the new interface and pick up tips, but the part of the invite that changed my mind was:
"followed by group and individual optimization sessions with members from the AdSense team."
Group session? I'm not going to put it out there, sorry, nope.
Not that I'm bashful mind you, but you have no clue who else is in the room.