A video of the discussion has gone online from TVW at the University of Washington. (C-SPAN also filmed the event.) I thought it was truly interesting. For an example of what's unique in Sidney Rittenberg's perspective: starting at around time 15:10, he talks about his close friendship not with the new president of China, Xi Jinping, but with Xi's father. "A fine man.."
FYI the person in the static screen shot above is not Rittenberg but Dennis Bracy of Seattle, a mutual friend and an organizer of this event.