The Marriage Celebrant Guidelines state that to avoid doubt, celebrants must avoid using the words ‘wedding’ or ‘marriage’ to describe the ceremony. Whilst the Guidelines do not specifically mention that "Husband" and "Wife" cannot be used, they do of course pertain to a "marriage".
A commitment ceremony could incorporate important rituals and provide photographic records; however, it has to be publicly made clear to everyone present that the ceremony is not a marriage.
Celebrants may conduct commitment ceremonies for a couple. These are "not" marriages and the commitment ceremony must not purport to be a marriage.
As a commitment ceremony is not considered a legal marriage, the celebrant must not prepare or submit any paperwork (such as the NOIM and declarations as to conjugal status). Witnesses are not required for a commitment ceremony. A certificate of marriage, or any other certificate referring to the Marriage Act, must not be prepared for a commitment ceremony.
Celebrants should deliver an appropriate introduction at the beginning of the ceremony making it clear to the guests that the ceremony is not a marriage ceremony and that if applicable the marriage has already occurred or is due to occur at a later date.