Creating a meeting from a public team channel invites everyone on the team.Â
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Go to a public channel on the team to invite, choose the
  down arrow button in the upper right, and select Schedule a meeting from the menu. - 
              
Type meeting title, date, time, and any details.
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Turn on the
  Send personal invites button in the  Add channel field to put the meeting on member's calendars. - 
              
Invite anyone outside the team as required or optional attendees and select Send.