Hangouts on Air Moves TOTALLY to YouTube!
By mid September 2016, you will not be able to start a HOA via Google+. But you can continue to start them via the YouTube Live Streaming Events area.

You can see the official announcement on this G+ page (for now):

The link that the page takes you to for help is:

Hangout Mastery members Q&A session discussed how to start up your HOAs via the YouTube Interface - member's only content:

This is a BIG change. No more SHOAE (Scheduled HOA Events) soon - Sept. 12th, 2016 is the end of that.
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