to join:
https://hangouts.google.com/hangouts/_/ytl/pCdxJsT7joDXA1kPtPWmoRLjAVrSOTZCf9cb6tqvsRQ=?hl=en_US&authuser=0
to watch:https://www.youtube.com/watch?v=Hx2v3CV5zbk
is only available to registered users. Visit the login page if you have an account. Otherwise visit the registration page to create one.