The Notice
of Intended Marriage doesn't lock you into a wedding
When
completing the Notice of Intended Marriage, you can
safely ignore the box on the top left of the Notice of
Intended Marriage, the one that says FOR CELEBRANT’S
USE. It doesn't have to be completed. I never have
written anything in it. Not once. In well over 1000
Notices completed and lodged with me.The Notice of Intended Marriage does not lock you into a day, time or place for the wedding. So you can be married any place (within Australia), and at any time and on any day between one calendar month after the day you lodge your Notice with your celebrant, and the day it expires (18 months after you lodge it).
You can download the Notice of Intended Marriage form here