Buddha's Birthday
Buddha's Birthday is held on May 5. Buddhist festival - 灌仏会 - Matsuri, which is held in Japan. It is also referred to as Hana Matsuri, "Flower Festival". This event in the first decade of the month May is annual. 
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The Buddha's Birthday is an important day of celebration for Buddhists around the world. The holiday is traditionally celebrated in most of East Asia to commemorate the birth of the Prince Siddhartha Gautama. He is the founder of Buddhism, and is also known as the Gautama Buddha. The Buddha was born into the royal family around 563/480 BCE in Nepal. After six years of ascetic practice, Siddhartha attained full enlightenment at the age of thirty five. As a result he became known as Buddha, or the awakened one. He died at the age of eighty in India. The exact date of Buddha's birthday is based on the Asian lunisolar calendars. It is primarily celebrated in Baisakh month of the Buddhist calendar and the Bikram Sambat month of the Hindu calendar. The date varies from year to year in the Western Gregorian calendar. However, it usually occurs in April or May and in leap years it may be celebrated in June.
Similar holidays and events, festivals and interesting facts
Greenery Day in Japan on May 4 (みどりの日 - Until 1988, April 29 was celebrated as the birthday of Emperor Showa. It was decided to keep this day a holiday even after his passing away in January 1989 and to name it Greenery Day because of the late Emperor's love of nature. In 2007, April 29 became Showa Day, and Greenery Day was moved to May 4);
Children's Day in Japan and South Korea on May 5 (Tango no sekku, also known as Ayame no hi );
Sony Day on May 7
Fork Day in Japan on May 9
Goku Day in Japan on May 9
Mother’s Day on May 11 (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);
The first day of Izumo-taisha Shrine Grand Festival on May 14