The livestream will begin at 16:30 (4:30 PM) according to the GMT -8:00 timezone. If you have the forum time in your profile set to your own timezone, then the time and date in the title of this event will automatically change to synchronize with the timezone you set there (presumably, your own local time).
The stream can be watched live here: www.twitch.tv/linustech
If you miss the stream, it will be archived on both YouTube and Twitch after the stream ends, and will be available for viewing at any time.