Possible Clues:

• Period of indulgence
• Wild licentious party.
• Fairly wild party
• Good to block leaderless Conservative party with many members exposed?
• Wild self-indulgent party
• Unbridled revelry
• It might be gory, but not necessarily bloody, and abandoned
• Abandoned to a gory extent, perhaps
• Perverted fun going in for gynaecology
• Group indulgence