The trouble with Sydney of course is that it is Australia's light pollution capital. The glow can be discerned hundreds of km away. Perhaps it would be better to fly into another city, do your observing from near there, and then only fly to Sydney for your meeting. I'm not sure what options you have but anywhere (except perhaps Melbourne) is better than Sydney.
BTW. As a long time observer of local weather I now know that there will be storms and floods on the 23rd and 24th October.
