Hanamatsuri celebrated at the Guadalupe Buddhist Church
Buddha’s Birthday: The birthday of the Prince Siddhartha Gautama, is a holiday traditionally celebrated in Mahayana Buddhism. According to the Theravada Tripitaka scriptures[which?] (from Pali, meaning “three baskets”), Gautama was born in Lumbini in modern-day Nepal, around the year 563 BCE, and raised in Kapilavastu.
According to this legend, briefly after the birth of young prince Gautama, an astrologer named Asita visited the young prince’s father—King Śuddhodana—and prophesied that Siddhartha would either become a great king or renounce the material world to become a holy man, depending on whether he saw what life was like outside the palace walls.
Śuddhodana was determined to see his son become a king, so he prevented him from leaving the palace grounds. But at age 29, despite his father’s efforts, Gautama ventured beyond the palace several times. In a series of encounters—known in Buddhist literature as the four sights—he learned of the suffering of ordinary people, encountering an old man, a sick man, a corpse and, finally, an ascetic holy man, apparently content and at peace with the world. These experiences prompted Gautama to abandon royal life and take up a spiritual quest.
Excerpt from Wikipedia