Hi Sasup,
SASI is having an open night on the 25/8 and 28/8 (Sat and Tues) respectively. The Tues. night is to co-incide with the lunar eclipse. The Sat. open night starts at 4pm. Worth going (abt $4) and bringing the family. There will be dobs, SCT's etc for viewing.
The observatory may not be ready for the public, but they're planning to use the scout hall next to it instead.
Bring your scope, more than likely someone will run you thru' the process of collimation.
Check out:
http://www.sasi.net.au/openite.html