When you import course content from a prior semester into a new course, it WILL duplicate all of the Zoom calendar events in Canvas from the prior semester. To avoid this when you are importing your course content do the following:
choose the Select specific content option under the Content header and do not select the Calendar Events checkbox to import into your course.
1. In the new course, go to Settings
3. Select the "Copy a canvas course" option
4. Import Content
1. Search for the course name you would like to import content from
2. Under Content, select the "Select Specific Content" option
3. Click the "Import" button