Rinne Festival

The Rinne Festival is a holiday in Konohagakure and possibly throughout the world.

Background
Beforehand, the Rinne Festival was a time of prayer but it has evolved into so much more. In recent times, the holiday had changed into one of the exchanging of gifts between loved ones and friends. It is held during the winter and apparently lasts for an unspecified amount of time.

The Last: Naruto the Movie
Two years after the Fourth Shinobi World War, as Hinata Hyūga planned to give Naruto Uzumaki a personal gift of love, Toneri Ōtsutsuki chose this time of year to begin his plan of destroying the Earth by crashing the Moon into it.

This is also the time of the year when a floating Island — the temple of Hamura — comes near Toneri's castle. When Hinata asks Toneri to take her to Hamura's shrine, she discovers about the Tenseigan that was used for war and the Tenseigan Energy Vessel hidden in the core of the Moon.

Trivia

 * The Rinne Festival is similar to the real-world holiday, Christmas. Both taking place in winter and envolve the exchange of gifts.
 * Given that the festival has the term "Rinne" in its name, it possibly has a connection to Hagoromo Ōtsutsuki, the Sage of Six Paths or the Rinnegan.