Explanation:

• Vesak Day 2021 is observed globally on 26 May.
• Vesak, the Day of Full Moon is the most sacred day to Buddhists all over the world.
• On this day, Lord Gautham Buddha attained enlightenment. The Day is commemorated by the United Nations every year.
• The Day is being celebrated by the United Nations since 2000. The decision to celebrate the birthday of Buddha as Vesak Day was first formalized at the World Fellowships of Buddhists conference that was held in Sri Lanka in 1950.