These are my 3 most used sites:
Next months schedule by state: http://www.racingaustralia.horse/Home.a ... 10/11/2018
Upcoming schedule by day, can filter by TAB and major race meetings: https://www.racenet.com.au/horse-racing ... splayName=
Group races by date and course: https://www.horseracinginfo.com.au/aust ... -races.php