head to this forum
http://nswminimoto.forumup.org/index.php
Join up and pm 'spooky' or 'nswminimoto' - they know exactly what the go is but from what i have read it is on every tuesday, not exactly sure of time (3pm-9pm maybe???). They even give updated weather reports for those who have to travel to make sure your not wasting your time. Also spooky went last sunday for the first time and was able to ride around the times karts were on the track from what i read too.
Stu