@mgaft here's a link that you may find useful:

https://santaclausoffice.com/story-santa-claus-office/

I have to add that this tasty and totally enjoyable prompt by @dirge should just be welcomed with a thank you. We run a contests with rewards without asking anything to the participants (nothing is mandatory). The Finish the Story contest is not a public service, we are not funded by Steemit and we don't gain anything out of it (just the fun of writing together). Dirge gave us one of his stories as free material to play with and, to put things into perspective, I don't think it's his job to guide you through the background of Santa Claus or receive criticism because he pointed to wikipedia. You can perform a 3 sec web search by yourself, like I did, and find everything you need.
Also, the prompt doesn't have to explain everything. When it's about fiction, the rule of show don't tell is a must (google it). Moreover, such approach creates the right conditions for the participants to eventually fill those "gaps" in the narration with their own interpretation.

Hope you get the constructive spirit of my comment 😉 I'm curious to read your second half, go with the flow and enjoy!