Yes
We took some clients out for dinner the other night who were from Australia and they do not celebrate Halloween.

Once they found out what they were missing they said someone needs to change that

My friend Nuria from Spain said most Europeans do not celebrate it either but are starting to for the kids sake.
Our Thanksgiving is also celebrated at a different time. The first Monday of October. A lot of people do not know that. It is because our seasons are shorter and we harvest sooner than the US