DD1 is away this week, but her newish development will be heaving with little ones and their parents doing the rounds.
The rule is either take one sweet from a container left outside, or, if the house is decorated, knock and the owner, usually in fancy dress will hand out a sweet to each caller. Most of the houses have balconies and witches and monsters will be illuminated on them. Unfortunately, last year was marred by bigger boys (about 12yrs old) who went round tipping entire bowls of sweets into carrier bags and laughing, swearing and bragging how much stuff they had - it was rumored they weren’t local and had come just to steal the treats.
My little estate is 30+, so no little ones here, although I do have an Autumnal pumpkin wreath on my front door.