Christina Smith of the 2011 World Science Festival, which is taking place in New York, June 1 – 5, 2011, very kindly notified me of a preview for the festival and for a livestreaming option. Here’s the preview (from the livestream channel website for the 2011 World Festival),

You can find a schedule of events which indicates the ones that are going to be webcast live. (Here’s my May 5, 2011 posting about this year’s festival.)