No — MeetingOS will never send anything to anyone without your explicit action.
When you connect your calendar, MeetingOS reads your calendar events to populate your Today view and automatically adds your meeting attendees to the meeting agenda in MeetingOS. However, this does not send them any emails, calendar invites, or notifications.
How sharing works
If you want to share your meeting agenda or notes with attendees, you have to do it manually:
To invite them to view the agenda in Contio, you can share the meeting link
To send notes after the meeting, use the Share button in the meeting summary
Nothing leaves MeetingOS unless you choose to send it.