This seems to be regional, which I never knew until we moved. We are from Michigan and Halloween is a *very* big deal. Neighbors go all out, decorating and having parties and eagerly await Halloween night to see the little ones dressed in their costumes. It is very common for parents to go trick-or-treating together, in a group and make a night of festivities (dinner, costumes (kids and adults), drinks perhaps, etc...)
We moved to Florida three years ago and hardly anyone participates.