Called All Hallow's Eve or Ancestor Night, it is when the veil between the two worlds is most pervious.  
            Observance begins at sundown on October 31. 
            This third and last of the three pagan Autumn harvest festivals acknowledges a time of cleansing and preparation for the darkness of Winter.  It is the most important of the four "greater Sabbats."  

Stonehenge Moon

I'll be seeing you in all the old familiar places
That this heart of mine embraces all day through;
In that small cafe, the park across the way
The children's carousel, the chestnut trees, the wishing well.

I'll be seeing you in every lovely summer's day,
In everything that's light and gay;
I'll always think of you that way.

I'll find you in the morning sun;
And when the night is new
I'll be looking at the moon,
But I'll be seeing you.
Irving Kahal