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"Grand High Climax" is said to be a major holiday celebrated by Satanists on December 24. Evangelical Christian author Jerry Johnston writes in this book that it is a celebration meant to juxtapose the Christian holiday of Christmas Eve, when the birth of Jesus Christ is celebrated. However this goal to blaspheme is not always prevalent.

Johnston claims that Grand High Climax is traditionally celebrated with a Black Mass, followed by great excesses of food, drink, sex, and merriment, but a rite called "Grand High Climax", and the details of the activities involved, is not a rite acknowledged by all Satanic groups. It was once part of the Satanic panic and beliefs about the Witches' Sabbath.