Rinne Festival

The 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.

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

Trivia

 * The Rinne Festival is similar to the real-world holiday, Christmas. In Naruto SD: Rock Lee no Seishun Full-Power Ninden, Christmas is the holiday celebrated.
 * Given that the festival has the term "Rinne" in its name, it possibly has a connection the Sage of the Six Paths or the Rinnegan.