Years ago, after reading "The Strange Case of Origami Yoda" by Tom Angleberger, one of my students suggested that we create a file to prove that Santa exists. Each student wrote a personal narrative about a "real life" experience they had with Santa. I arranged to have my students share their "case file" with a 1st grade class and we brought in cookies and milk and had an absolute blast.
The activity has taken a life of its own and now our entire 5th grade team (six classes) participates. For the past few years, I've had students who were 1st graders when my class presented the file to them. My students this year are beyond excited to write their stories.
This is such a fun way to write personal narratives-especially since 5th graders are in their "golden age" of childhood. I am grateful that my school supports this activity. I'm sure it probably wouldn't fly well where there are many families who do not celebrate Christmas. I live in Maine, so we are not very diverse...but my daughters teach in Boston and they couldn't do this.
I have included directions, a writing rubric, a writing organizer and my own personal narrative. Sorry it's in landscape-it was the only way I could get it all into one document.
Good luck and have fun!