Halloween is getting popular in Japan. Japanese people focus putting the costume on – not trick or treat traditional customs.
Yokosuka area has also Halloween festival, costume contests and so on.
This coming Saturday 29th, different venue has different festival. Closest location is Dobuita-street and Yokosuka Chuo station area.
Actual Halloween is on October 31st and this year is Monday… If you are planning to join Halloween party, most events are held on Friday and Saturday. The popular place to see the people with the costume would be Shibuya area in Tokyo.