Task: In the Calendar app, create an event called a book fair because I have a book fair to attend on Sunday with my friends.
Steps:
Open the calendar app.
Click on the add icon at the bottom right corner of the screen.
Click on the event option at the bottom right corner of the screen.
Type Book Fair as the title of the event.
Click on the date.
Select 24 September as the date. 
Click on the OK option at the bottom right corner of the screen.
Click on the save option at the bottom right corner of the screen.