OCC where my kids go has some places that are set for fixed bookings plus they have casual spots for short notice eg a weeks notice, They only offer max of 5 hrs (0915 till 1415) and charged in blocks of time if late to pick child up.

Many OCC may not be able to operate next year as they are now as the fed govt stopped funding a year ago and state took over and they have decided to cut funding so centres are going to have to A put prices up, B cap numbers and loose staff or C find other alterantive to cover funding!!

Not sure of how other places work I know a friend used 1 in point cook and could book in some times a day or so before she needed it.