Holidays and observances
April Fools’ Day or All Fools’ Day
Christian Feast Day:
Cellach of Armagh
Hugh of Grenoble
Melito of Sardis
Tewdrig
Theodora
Walric, abbot of Leuconay
April 1 (Eastern Orthodox liturgics)
Civil Service Day (Thailand)
Earliest day on which Sizdah Be-dar can fall, while April 2 is the latest; celebrated on the 13th day after vernal equinox. (Iran)
First Day of School at schools in Japan
Edible Book Day
Fossil Fools Day
Kha b-Nisan, the Assyrian New Year (Assyrians)
Islamic Republic Day (Iran)
Orissa Day (Orissa, India)
The Capture of Brielle, marked a turning point in the uprising of the Low Countries against Spain in the Eighty Years’ War. (Brielle)
The start of Miyako Odori, an annual geiko dance celebration. (Gion District, Kyoto, Japan)
Užupis Day, celebrate the independence of Užupis.
Veneralia, in honor of Venus. (Roman Empire)
Ram Navami and Swaminarayan Jayanti in Hinduism (normally a holiday in India, but this time its on a Sunday) (2012)
Renjiveda's Ocean of Love - "renjiTham" 