I always hate their confusing sites.

Why is your link not showing the same as https://events.google.com/io/

what should I be watching?

edit. seems your link work and my stream does not. thank you for stopping me from missing the event.

It can, it's your network that's the issue.

My network is fine, and it broadcasted Build 2017 w/o problems.

Streaming on my tv in high def via my chromecast without an issue.