Congeries is a collective noun meaning "a disorderly collection or jumble." This is taken from the Latin verb congerere "to heap up."
This word best describes Christmas preparations - the intentions, the results, the mess in my room. I cheer myself up by imagining that Santa's workshop is a terrible disaster (the mess!) and Christmas' best keep secret. There's a reality television show for you: overworked elves who complain of constant foot pain due to long hours and the shoes they have to wear; piles of discarded toy parts; the floor a definite hazard with tinsel and glitter and glue everywhere; not to mention the reindeer leavings; interviews with the elves who maintain Santa's sleigh: "you wouldn't believe the mileage on this thing..."