Titan Unbirthday Celebrations

What are we doing today, Mom.
I don't have anything special planned, Charlie.  Why, is there something special about today?
Mooom!  You know what day it is!
Really, I'm not sure, perhaps you should tell me.
Mom!  You know I can't tell you.  Please, can we?
Ok, Charlie.  I'm just playing. Today is, of course, your Unbirthday, the uncelebration of your unarrival in the unworld.  There, I've said it first.
Yay!  I get an Unbirthday Party.

On the frigid moon Titan, orbiting Saturn, birthdays are not celebrated, because it is thought, superstitiously, that to celebrate a birthday is to invite misfortune.  Instead, the unbirthday is celebrated.  This celebration, filled with a myriad of special rules and requirements, is held on the day opposite the birthday, precisely 182 days before or after each birthday. Unbirthdays are often celebrated with a simple meal with close family, among adults, but for children the tradition of the Unbirthday Party is a special and much-loved treat that requires great effort to avoid spoiling the opportunity.

The Unbirthday Party

There are many rules to follow if a child wishes to have an Unbirthday Party. The first, and often most difficult, is that the child must not be the first to bring up the possibility.  Particularly on the appointed day, someone other than the Unbirthed must mention an Unbirthday Party first, either announcing the party or asking about it.  Once the party is mentioned, then the child is free to talk about it to their heart's content, and most young children will chatter on about their hopes and imagined benefits of their party for hours on end if permitted to.  It is very common for parents to arrange some chore for the Unbirthed on their unbirthday in order to gain some brief respite of relative silence.  The second rule of the Unbirthday Party is that it must be a surprise.  The guest list, the gifts, the activities, nothing can be mentioned in advance, lest these plans leak to the hand of fate and some misfortune befall the party.  In practical terms this means that guests are usually notified at the last minute, and everyone, except the party planner, is constantly wondering what will happen next.  Every Unbirthday Party is unique and sometimes a good planner will switch around activities on the fly to ensure that everyone is constantly surprised.  The last major rule of the Unbirthday Party is that the planner must be a relative, but not part of the immediate family.  This means most Unbirthday Partys are planned by an aunt or uncle, or, if no relatives are available, a close family friend who has been permanently designated as an Unbirth Grandparent, which allows them to plan the party on behalf of absent family.

The events and contents of an Unbirthday Party vary widely, but some items are common, and one is required.  The one required item, what every party includes, is that the Unbirthed is congratulated on their Unlife while they receive a singular gift from each attendee.  This practice is, like all aspects of the party, intended to mislead and misdirect the hand of fate that this is not a living being that must die, and therefore ensure a long life into the future.  Common practices include, of course, the playing of a game; often the game will be a child's game of hiding or misdirecting, although older youth may have a game entirely composed of role-play and misinformation to further distract the hand of fate.  Food, as might be expected, plays a large part in nearly every party, but the nature of that food, whether snacks, candies and cakes, rare ice cream, a full meal, or even just fizzy drinks varies wildly.  The one constant in an Unbirthday Party is the surprise and unpredictability, so it is not unheard of for a party to have multiple food events, or even no food at all; the food being a meal before or after the party instead, often with different guests and known well in advance.  The last common event, in various forms, is the wander.  When a party planner wishes to be particularly creative, they may require that the Unbirthed engage in a wander or series of unpredictable turns and redirections along a substantial walk through the less often used areas of their massive colony vehicle to arrive at the location of the party, or a second location where the party moves partway through.  This practice is intended to even further confuse and confound the hand of fate by making the Unbirthed harder to find and track.