1. To open the calendar, from the home screen, select Calendar.
   
2. Review the What's New in Calendar prompt then select Continue.
   
3. Review the Allow location access to Calendar prompt then select Don't Allow or Allow.
   
4. To view the Calendar by month, select the Back arrow.
   
5. To create a new event, select the + icon, or select and hold an Empty spot on the calendar.
   
6. Enter the Desired event title and location. 
   
7. To change the Event start time, select "Starts" then edit the time as desired.
   
8. To change the Event end time, select "Ends" then edit the time as desired.
   
9. To add an Alert to the event, select Alert.
   
10. Select the Desired Alert time.
    
11. When you are done creating the Event, select Add to add the event to your calendar.
    
12. The event will now be displayed in your calendar.
    
13. To edit an event, from the Calendar, select the Desired event, and then select Edit.
    
14. Edit the fields as desired, and then select Done.
    
15. To delete an event, from the Calendar, select the Desired event, and then select Delete Event.
    
16. Select Delete Event again to confirm.
    Note: Learn more from Apple support article: Calendar: Reply to an event or calendar invitation