Wesak commemorates important events in the Buddha's life - his birth, enlightenment, and passing away (parinibbana). The document provides brief descriptions of 12 key moments in the Buddha's life, such as his practice of asceticism, acceptance of food from Sujata, enlightenment under the Bodhi tree, and first sermon teaching the Four Noble Truths. It concludes with wishes for compassion and wisdom on Wesak.