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The limbo-like state between a daytime activity (party, barbeque, crawfish boil, festivity, etc.)and a night time party.

Party Purgatory usually conveys the idea that one has yet to determine what night-time event to pursue.

Usually, the period of party purgatory is a good opportunity to catch a nap, meal, shower, or change of clothes.
Phone Call: "Hello...Yeah, we just got in from the Crawfish boil and are just hanging around the house for a little while.......No I don't know if we are going to the concert or to Sally's party yet. We are in Party Purgatory right now.
by The Mahatma December 27, 2008