Nick Bostrom toured a bunch to promote Superintelligence after it came out. This included presentations, basically he would give a very condensed summary of the book, roughly the same each time. For anyone who's read the book you're probably not going to hear anything new in that.
However, the Q&As that took place after these presentations are a somewhat interesting look at how people react to hearing about this subject matter.
Talks at Google, the Q&A Starts 45:14. The first person in the audience to speak up is Ray Kurzweil.
His talk at the Oxford Martin School, Q&A starts at 51:38.
His talk at UC Berkeley, hosted by MIRI. Q&A starts at about 53:37.
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