Bak Full Moon Poya Day in Sri Lanka
Bak Full Moon Poya Day in Sri Lanka is held on April 1. Commemorates the second visit of The Buddha to Sri Lanka. This event in the first decade of the month April is annual. 
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Bak Pura Pasaloswaka Poya Day commemorates the second visit of The Buddha to Sri Lanka which took place in the fifth year of his Supreme Enlightenment. It is a national holiday in Sri Lanka. It usually falls in April.
According to the Mahavamsa, an epic poem that relates the history of Sri Lanka, the Buddha visited Nagadipa as he wanted to put an end to the feud between two groups belonging to the Naga community (King Mahodara and his nephew, Chulodara) and bring peace to the land.
Having brought peace to the island, the warring kings had offered the precious throne to the Buddha. He courteously declined the gift. The throne was returned to the Naga Kings and was later enshrined in the Rajayathana stupa at Nagadeepa Rajamaha Viharaya, an ancient Buddhist temple built on the site where the events took place.
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Bengali New Year on April 15 (or Poila Boishakh. Sri Lankans begin celebrating their National New Year);
Mother’s Day on May 10 (Anguilla, Antigua and Barbuda, Aruba, Australia, Austria, Bahamas, Bangladesh, Barbados, Belgium, Belize, Bermuda, Bhutan, Bonaire, Botswana, Brazil, Brunei, Canada, Cambodia, Cayman Islands, Central African Republic, Chad, Chile, China, Colombia, Congo, Dem. Rep., Congo, Rep., Cote d'Ivoire, Croatia, Cuba, Curaçao, Cyprus, Czech Republic, Denmark, Dominica, Ecuador, Equatorial Guinea, Estonia, Ethiopia, Faroe Islands, Fiji, Finland, Germany, Gabon, Gambia, Greenland, Ghana, Greece, Grenada, Guyana, Honduras, Hong Kong, Iceland, India, Italy, Jamaica, Japan, Kenya, Latvia, Liberia, Liechtenstein, Macau, Malaysia, Malta, Myanmar, Namibia, Netherlands, New Zealand, Pakistan, Papua New Guinea, Peru, Philippines, Puerto Rico, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, Singapore, Sint Maarten, Slovakia, South Africa, Sri Lanka, Suriname, Switzerland, Taiwan, Tanzania, Tonga, Trinidad and Tobago, Turkey, Uganda, Ukraine, United States, Uruguay, Vietnam, Venezuela, Zambia, Zimbabwe);
Mullivaikkal Remembrance Day on May 18 (Sri Lankan Tamils);
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Father's Day on June 21 (Ñelebrated on the third Sunday of June øò Argentina, Aruba, Canada, Costa Rica, France, Greece, Hong Kong, Hungary, India, Ireland, Kenya, Japan, Macao, Malaysia, Malta, Mexico, Netherlands, Pakistan, Peru, Puerto Rico, Singapore, Slovakia, South Africa, Sri Lanka, Trinidad and Tobago, Turkey, Venezuela, United Kingdom)