Microsoft Teams Channel Calendars provide a simple way to track meetings for a specific channel community. Entries are also integrated into personal calendars so individuals always have a single source of truth for their daily schedules.
If Teams have external Guests assigned to them, they won’t unfortunately be able to access the Channel Calendar tab. Although they will receive an invite for any meeting scheduled and it will appear in their personal Teams and Outlook calendars.
Check out this short overview demonstration to get yourself started:
Note: As is the case with meetings created directly within the channel, when you schedule using your Channel Calendar you can also invite people inside and outside of your organisation who are not part of the Team.