The Apple live event is officially not live.
The video feed didn’t work for longer than 30 seconds on my iMac (10.9 with Safari). Didn’t work at all on my iPad Air. Later on into the Keynote on the iMac I got a very poor quality feed, and it kept crashing Safari on my iPad.
I think apple are going to need to take a long look at what went wrong. Did you manage to get a feed working?