Task: In the Calendar app, change the reminder time for the event from 30 minutes to 15 minutes.
Steps:
Open the calendar app.
Click on the book fair event.
Click on the edit icon at the top right corner of the screen.
Click on the add notification option at the bottom of the screen.
Select the 15 minutes option on the pop-up list.
Click on the save button on the top right corner of the screen.