Task: The quality of the work is getting low and the project is at risk. The manager has asked to postpone the RCA meeting to September 24th at 09:30 AM in the calendar app.
Steps:
Click on the RCA meet event
Click on the Edit button 
Go to the Dates section
Set the Event date to 24
Click on the OK button in the pop up
Click on the Save button at the top right corner of the screen