Any plans trick-or-treating tonight with the kids? Or painting the town red in your costumes? Then again, Japanese doesn't need Halloween to go out in costumes if you take into account those cosplayers. ;)
From what I observed, stores in Japan sure embraced the Halloween wholeheartedly with all the Halloween merchandise being sold.
Even Ultraman isn't spared, as can be seen at the M78 shop (official Ultraman shop).