With meetings enabled the app allows attendees to send and accept meeting invites. Meetings can be between two or more attendees. Self scheduled attendee meeting invitations are created from a message thread. 

How to send a meeting invite:

The meeting invite button is accessible from any message thread. 

• From an attendee profile tap the "Request Meeting" button. This will send the invite in a new meeting invite message (or add to an existing message thread if you have previously messaged the recipient).
• Tap the meeting button on an existing thread to invite the members of that message group.
• Create a new message group and tap the meetings button to invite them to a meeting.

Accepting and viewing meetings:

Meeting invites appear and can be accepted from a message thread. Attendees may also reject invites or respond tentatively with a "Maybe".

Once an an invited attendee responds with accepted or maybe the meeting will appear on user's My Schedule.