For those who might like to do this again, the NRMA Motorfest is on the 26th January 2008.

To be eligible to participate in NRMA Motorfest™ 2008,
your vehicle needs to be at least 30 years old, (ie. it must
have been built before 1978 or be identical to pre-1978
models).
Once we have received your registration form, you will
receive a letter advising if your registration has been
accepted. This will include arrival times and setup
details. Where appropriate, vehicles will be displayed
in marquees, and clubs will be kept together.
Registration is on a first in basis (depending on the
number and variety of vehicles) and will be accepted
up until Friday 9th November 2007 or earlier if the
total allocation of spaces has been filled.

Get form and more info here