Did you check the Live Webmaster Hangouts Schedule posted by Google?
April 8, 2016
Kanika Kanojia
Now, it is easier to get an answer for your queries from experts at Google. Just check the new calendar of upcoming live events posted by Google.
All you need to do is to choose the ones relevant to you in terms of language and topics; click on the Q&A icon and submit your question. If it is unique enough, there’s a great possibility that it would be answered by Mueller or other Google experts answering the session.
The new live schedule will help SEO professionals to prepare questions in advance based on the topics of discussion.
People who are new to this practice should know that SEO practitioners ask questions via the Q&A moderator on Google hangouts. Most of these are answered by John Mueller; Webmaster Trends Analyst at Google who begins with questions submitted in the Q&A system and then goes to live questions.
Below is the snapshot of How to join Google Search Central office hours:

Image Source: developers.google.com