Australians don't celebrate Thanksgiving in the same sense as Americans. They have a national day of Thanks, in which you thank others and God for that which you are, well, thankful for. However, Australia is a country founded to house convicts. They never had to survive a harsh winter (even in the south the winter is still quite warm compared to Mass.) and they never held a speific religious convition to forming their own country - it was simply easier to stay there after they had finished their term of punishment. Thus, they don't celebrate Thanksgiving in way that one would suspect.