Your course may require more than one teacher. Teachers can add/remove events and learners under User Permissions.
Let's add and remove a teacher together:
Adding a Teacher
In the left navigation bar click "Courses" and go into your course. Click "Settings" at the bottom of the left navigation bar. Navigate to the "Teachers" tab and then click the "+ Add Teacher" button and follow prompts.
Removing a Teacher
Navigate to the "Teachers" tab in settings, click the three "dots" on their profile card and remove the teacher.