It commemorates the enlightenment of Siddhartha Gautama, who became the Buddha ... Siddhartha decided to meditate under a pipal tree, also known as a sacred fig tree, until he reached enlightenment.
Summary: Bodhi Day marks the moment 2,500 years ago at which Siddhartha Gautama attained enlightenment ... by mediation and by decorating a small fig tree with coloured beads and lights.