How to clear Teams Calendar

Remove shared, team, group and SharePoint calendars

When you open these calendars in Outlook, they’re added to the folder pane in the Calendar. This lets you quickly view the calendar with only one click.

To remove shared, team, group, and SharePoint calendars:

Right-click the calendar, and then click Delete Group or Delete Calendar.

Outlook asks you if you want to remove the group or calendar, and move its contents into the Deleted Items folder.

Click Yes to confirm the deletion.

The calendar is removed from the folder pane and no longer appears in the Calendar. Because you were viewing a copy, the source calendar remains intact and only your copy gets deleted.
Link: https://support.microsoft.com/en-us/office/delete-a-calendar-9ba1364c-bdb0-41be-8f66-eaf96698d021#__toc366745314

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Nikolino
I know I don't know anything (Socrates)