That usually doesn’t happen but this time along, Apple will be providing the official live stream of the event.
The event will kick start at the following timings
07:00AM – Hawaii
10:00AM – Pacific
11:00AM – Mountain
12:00PM – Central
01:00PM – Eastern
06:00PM – London
07:00PM – Paris
09:00PM – Moscow
02:00AM – Tokyo (September 2nd)
You need to be on Mac, iPhone, iPod or iPad to view the live stream.
Live stream will be provided here
Update:
It can also be viewed on Windows and Linux. Just download VLC player -> Open Media -> Network
and paste this source
http://devimages.apple.com/iphone/samples/bipbop/gear1/prog_index.m3u8