Vesak Day
Vesak is an annual holiday observed traditionally by practicing Buddhists in many Asian countries like India, Nepal, Hong Kong, Singapore, Vietnam, Thailand, Cambodia, Malaysia, Sri Lanka, Myanmar, Indonesia and Taiwan.
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The exact date of Vesak varies according to the various lunar calendars used in different traditions. In Theravada countries following the Buddhist calendar, it falls on the full moon Uposatha day (typically the 5th or 6th lunar month). In China it is the fourth month in the Chinese lunar calendar, coinciding with the first full moon of that month. The date varies from year to year in the Western Gregorian calendar but falls in April or May.
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In Mahayana Buddhist traditions, the holiday is known by its Sanskrit equivalent, Vaiśākha. The word Vesak itself is the Sinhalese language word for the Pali variation, "Vesākha". Vesak is also known as Buddha Purnima or Buddha Jayanti in India, Bangladesh and Nepal, 花祭 (Hanamatsuri) in Japan, 佛誕 (fó dàn) in Chinese-speaking countries, Saga Dawa in Tibet, Visaka Bochea in Cambodia, Visakah Puja, Visakha Bucha in Thailand, Phật Đản in Vietnam, Waisak in Indonesia, Vesak (Wesak) in Sri Lanka and Malaysia. The equivalent festival in Laos is called Visakha Boussa and in Myanmar is called Ka-sone-la-pyae meaning Fullmoon Day of Kasone which is also the second month of the Myanmar Calendar.

The decision to agree to celebrate Vesak as the Buddha’s birthday was formalized at the first Conference of the World Fellowship of Buddhists held in Sri Lanka in 1950, although festivals at this time in the Buddhist world are a centuries-old tradition. The Resolution that was adopted at the World Conference reads as follows:
“That this Conference of the World Fellowship of Buddhists, while recording its appreciation of the gracious act of His Majesty, the Maharaja of Nepal in making the full-moon day of Vesak a Public Holiday in Nepal, earnestly requests the Heads of Governments of all countries in which large or small number of Buddhists are to be found, to take steps to make the full-moon day in the month of May a Public Holiday in honour of the Buddha, who is universally acclaimed as one of the greatest benefactors of Humanity.”

On Vesak Day, Buddhists all over the world commemorate events of significance to Buddhists of all traditions: The birth, enlightenment and the passing away of Gautama Buddha. As Buddhism spread from India it was assimilated into many foreign cultures, and consequently Vesak is celebrated in many different ways all over the world.
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References :
Wikipedia : Vesak
See the days on which Vesak is celebrated :

Vesak Day

Year Month Day Day of Week
2008 May 19 Monday
2009 May 09 Saturday
2010 May 28 Friday
2011 May 17 Tuesday
2012 May 05 Saturday
2013 May 24 Friday
2014 May 13 Tuesday
2015 June 01 Monday
Related Holidays :
New Year Chinese Lunar New Year Good_Friday Labor Day Vesak Day
National Day Hari Raya Puasa Deepavali Hari Raya Haji Christmas
Singapore Holidays List
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