It's very hit and miss over here. Some areas do it, others don't. We've not had any for the last 5 or 6 years although in some parts it's popular.
It's just a prelude to the main event anyway.
When I was a kid we didn't have pumpkins, my mum used to carve a swede which I hated. Then as a "treat" we could go apple bobbing. Basically filling a bowl with water then floating apples in it.
You had to eat the apple with your hands behind your back.
Trick or treat didn't emerge over here until much later, the late 80s early 90s.