All souls in Purgatory are released for forty-eight hours from All Hallows Eve.
On these nights they are free (gaelic).

On Halloween, the wind blowing over the feet of the deceased bears
sighs to the houses of those about to die within the year (Wales).

If you go to a crossroads on Halloween and listen to the wind, you will learn
all the most important things that will befall you the next twelve months.

If you take a three-legged footstool and sit at the crossroads while the
church clock is striking twelve on Halloween, you will hear proclaimed aloud
the names of the parishioners doomed to die within the next twelve months.
If you throw an article of clothing belonging to any one of those doomed
people into the air and call out their name, you can keep death from stalking
at their door (Highlands of Scotland).

To ensure fertilty of crops during the coming year, make a circuit of the
fields with a lighted torchon Halloween (England).

On Halloween, force all the sheep and lambs to pass through a hoop of
rowan wood to ward of Witches and faeries (Strathspey, England).

A gambler who hides under the tendrils of the blackberry bush and
invokes the aid of the ancients will have good luck with the cards (Ireland).

If you hear footsteps following you on Halloween, you should not look around,
for it is the dead who are following, and if you meet thier gaze, you will die (Ireland).

On Halloween Eve, do not look at your shadow in the moonlight,
or you shall be next to haunt a graveyard (England).

Children born on Halloween will enjoy lifelong protection against evil spirits
and will be endowed with the gift of second sight (rural America).

A burning candle placed inside a hollowed out pumpkin on Halloween
will keep evil spirits and demons away.

For goodluck burn orange and black candles on Halloween 
(Black and orange are traditional colors of Halloween, and on this day
their magickal vibrations are at thier peak.)

Always burn new candles at Halloween to ensure the best of luck.
Likewise, it is not good to burn Halloween candles at any other time of the year.
To do so may cause you to experience bad luck and/or strange happenings
over which you will have no control.

Sources,
The books :
Halloween - Silver Ravenwolf,
The Pagan Book of Halloween - Gerina Dunwich