Administrators are able to add events to the calendar for all users to see. If you need to delete an event you added, first go to List View view and then click Delete next to the event you would like to delete.
You cannot delete an entry associated with an opportunity, but you can hide details from applicants so they aren't visible on the Calendar.
Have more questions about this topic? Go to the Community Forum to pose the question to other users or submit a support ticket to InfoReady.