Passage: Following the major 1973 renovation funded by UNESCO, Borobudur is once again used as a place of worship and pilgrimage. Once a year, during the full moon in May or June, Buddhists in Indonesia observe Vesak (Indonesian: Waisak) day commemorating the birth, death, and the time when Siddhārtha Gautama attained the highest wisdom to become the Buddha Shakyamuni. Vesak is an official national holiday in Indonesia, and the ceremony is centered at the three Buddhist temples by walking from Mendut to Pawon and ending at Borobudur.

Question: What does the Vesak commemorates?
the birth, death, and the time when Siddhārtha Gautama attained the highest wisdom to become the Buddha Shakyamuni