You can start it now right away! Have fun and have a meaningful "Trick or Treat" in your neighbors. See kids hanging around with their colorful and some has a funny costumes. Right now, authorities keep an eye to sex offenders because there might be someone who just wait for any single moment to get your kids from the street.
Keep an eye to your kids too. Have the time to have fun all day long, because it's another big celebration celebrated by the world. Feel the spirit of Halloween within.