The Aztec, in particular, would celebrate their dead for the entire month of August.
The celebration takes place on November 1st and 2nd, in connection with the Catholic holidays of All Saints' Day (November 1) and All Souls' Day (November 2).
Traditions connected with the holiday include building private altars honoring the deceased using sugar skulls, marigolds, and the favorite foods and beverages of the departed and visiting graves with these as gifts.
Purgatory is for those who have died in a state of sin, but not mortal sin.
These people must wait in purgatory until they are cleansed of their sins by the prayers of the faithful on Earth.
It is easy to see why these celebrations can be heartbreaking, even to outsiders.