A Person who works extensively with a Cruise Director (a/k/a Social Planner) to find out his/her group's social plans, but does not, and never intended to, actually participate. Generally does this simultaneously with many different Cruise Directors to ensure his/her being included in several concurrent events.
The Plan Collector may run an internal algorithm to determine the "most fun" event, and go with that, or simply do nothing, resting assured that they could have done "something". May resurface, possibly years later, to ask how it went, and get details of the next event. Long term use of collected plan data is unknown and suspicious.
Etymology: coined by Cindy (2005), details contributed by Scott
Synonyms: Census Taker (coined by Scott)
Don't worry about Bob, he's a Plan Collector and won't actually join us.