We’re adding a new way to invite people to an ongoing meeting directly within Hangouts Meet. When you’re in a Meet meeting, you’ll now see an option to “Add people” at the top of the participant list.

Add people directly from the call

Clicking on this option will open a dialog box to send them an email invite to join as a full participant or call them into the meeting by phone.

To invite someone into your meeting, simply input their email address or lookup by name from the company directory.The invited participant will receive an email with instructions to join your meeting.

Enter the person's name, email address, or phone number

As always, inviting someone using their phone number will immediately call the phone number to to add them to the meeting. They will join as an audio only participant and will not see any video or the screenshare.

For more information on inviting people to Meet meetings, check out the Help Center.

Launch Details
Release track:
Launching to Rapid Release, with Scheduled Release coming in two weeks

Editions:
Available to all G Suite editions

Rollout pace:
Gradual rollout (up to 15 days for feature visibility)

Impact:
All end users

Action:
Change management suggested/FYI

More Information
Help Center: Invite people

Launch release calendar
Launch detail categories
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Source: G Suite Updates Blog