To what the WWDC use the official Apple's site.
Before click in the play button you must have this requirements:
Live streaming uses Apple’s HTTP Live Streaming (HLS) technology.
HLS requires an iPhone, iPad, or iPod touch with Safari on iOS 7.0 or later, a Mac with Safari 6.0.5 or later on OS X v10.8.5 or later, or a PC with Microsoft Edge on Windows 10.
Streaming via Apple TV requires an Apple TV (2nd or 3rd generation) with software 6.2 or later or an Apple TV (4th generation).
Follow the people get in on Apple's building here
Courtesy of 9to5Mac.
Stay connected, this topic will be updated as Apple show us the news.