So how do you grow grass (in autumn and in a short period of time) - and these are my words, not someone elses advice so follow at your own risk.
First, clear the plot of any dead leaves, possum poo, and lolly wrappers. Preferably not with the kids beach toys.
Next turn it all over to get it "fluffy" to aerate the soil. Try not to let the kids stand on it. Give it a good hose down,
Sprinkle the grass seed over shaking through your colander to stop the seed clumping.
Then stomp it all down.
Give another good hosing.
And keep hosing regularly for the next couple of weeks.Will keep you posted on whether this works!!!