How do I delete a calendar item?
Event creators can delete items they created in Calendar. This will remove the item from the Calendar tool in the site and from each site participant's My Calendar in Home.
Go to Calendar.
Select the Calendar tool from the tool menu in your site.
Select the item you want to delete.
Select Remove event.
You will be prompted to confirm the removal. If you are sure you want to delete the item, select Remove event.