@shanan_ballam , the quickest and easiest way I’ve found is by flipping your calendar to Agenda view and deleting them from there (click on an assignment name and choose delete). Otherwise you can delete them from the regular calendar view as well. 

This guide shows where where you can find the delete button - How do I edit an event or assignment in the Calendar? 

This guide shows how to view Agenda view - https://community.canvaslms.com/docs/DOC-12911-415254669 

Hope this helps! Kona