Here you can watch or join in on the official English Google Webmaster Central office-hours hangout. You can watch as a lurker or join in on the video conference using Google Hangouts.
Usually hosted by Webmaster Trends Analyst, John Mueller.
If you happen to miss one of these events, you should visit the official community page where you can view upcoming livestreams and set a reminder to notify you when the next one begins.
Be sure to think of any questions you may have about topics such as indexing, crawling, sitemaps, duplicate content, rankings, etc.
I’m pretty sure John is located in Switzerland, so hangouts may occur at unusual hours.
This one is scheduled to take place at at 3:00 a.m. Eastern Time in the United States.
To ask a question, leave a comment on the Google Webmasters community page for the corresponding event.
You can also see a calendar view of upcoming events here: Google Webmaster Events Calendar