Kavli Frontiers of Science: is it a worthwhile use of one's time? I recently received an invitation to a "U.S. Kavli Frontiers of Science symposium."  I have to be honest, when I first received it, I kind of thought it was conference spam, but investigating further, I came around to thinking it seemed legit (in part because it is organized by NAS and they offered to pay expenses).  

But "is a legitimate scientific activity" is a pretty low bar for deciding whether it is worth expending one's limited time to attend a conference (at some minor personal inconvenience), which at least for me is not obviously connected to my research or even necessarily my discipline.  Does anyone here have experience with it?  Are the talks interesting for outsiders to the disciplines?  Is it actually a good networking opportunity?  Is it the sort of thing I should be bragging to my dean about (I'm about to go up for tenure, so bragging rights are somewhat relevant)?  Is it just sort of a glorified TED?
Yes, it's definitely worth attending and you should mention it to your dean.  (It's only a minor honor, but a minor honor is still worth highlighting.)  I did this some years ago, and it was a great experience.  Not particularly valuable for my research, but I met some fascinating people in other fields, some of whom I had more in common with intellectually than I had expected, and I learned many interesting things.