I am a big proponent of Halloween in Australia.
One reason is that when I was very young we still celebrated guy Fawkes night on November 5 with bonfires and firecrackers (Guy Fawkes night is an English celebration commemorating the interruption of a terrorist plot in London in 1605). Firecrackers were banned in Victoria in 1982 which led to the demise of Guy Fawkes night.
Another reason is my brother — he lives in a suburb wherever half the people on the street celebrate Christmas and the other half celebrate the end of Ramadan, but they all do Halloween.
I think replacing an English import with something where you get to dress up and meet your neighbours while snacking on delicious treats is great.
And I love seasonal decorations — so here are some particularly Australian Halloween decorations.
The top half are Australian animals etc
Flying Fox (bat)
Funnel web spider
The second half is Australians smiling which seems to look much scarier in black and white on a mandarin than IRL