Rinne Festival

The Rinne Festival is a winter holiday celebrated in Konohagakure and possibly other parts of the world. Originally just a time for prayer, the Rinne Festival has since evolved into a holiday where friends and loved ones exchange gifts.

On the moon, the Rinne Festival coincides with the time of the year where the floating island — the temple of Hamura — comes near Toneri's castle.

Trivia

 * The Rinne Festival is similar to the real-world holiday, Christmas.
 * Given that the festival has the term "Rinne" in its name, it possibly has a connection the Sage of Six Paths or the Rinnegan.