This was the live viewing link globalclimateactionsummit.org/live
Speakers included Al Gore, Andrea Mitchell, Gina McCarthy, Jane Goodall and many others.
Global Climate Action Summit homepage
and Affiliate Events
And a list of CCL-sponsored events, mostly on Thursday in SF:
Here’s the event website.
There are many events planned by other groups for Sep 10-14th to coincide with this summit for example Sustaining All Life.