It's Buddha's Birthday! And to commemorate his birthday, Buddist Temples worldwide mark this day with a ceremony called “The Washing of Buddha.” I doubt there is little coincidence the Monks picked this time by accident over 2,500 years ago. If you are wondering when Christianity was founded, it was approximately 1,971 years ago. Buddism is one of the world's oldest religions, followed by Hinduism, over 4,000 years old.
If you would like to learn more about the Washing of the Buddha Ceremony, here are some links Anne recommends.