Today's celebrations

April 15th has a bunch of celebrations to consider:

Tax Day: Income Tax Pay Day (US & Philippines)
National Take a Wild Guess Day
National That Sucks Day
Rubber Eraser Day
National Glazed Ham Day *
Global Youth Service Day
Law of universal gravitation Day (1726): Isaac Newton develops theory upon seeing an apple fall in his garden

DNA Day (varies) 
Education and Sharing Day

Titanic Remembrance Day: The Titanic hits an iceberg in the Northern Atlantic ocean as sinks. (1912)
Jackie Robinson Day: Jackie Robinson breaks color barrier in 1947 (Major League Baseball)


Christian Feast Day: Abbo II of Metz, Father Damien Day (Hawaii), Hunna, Paternus of Avranches
St. Aristarchus' Day
Arirang Festival, held to commemorate Kim Il-sung's birth. (North Korea)
Fordicidia, in honor of Tellus. (Roman Empire)
Father Damien Day (HI)
Emancipation Day' observed (DC)
Latest day on which New Year festivals in South and Southeast Asian cultures can fall. (see April 14)


(* in posts, previously or to follow)

(^ Photo credit: Tax maze, forum.belmont.edu; DNA, ghr.nlm.nih.gov; Titanic siniking, anunews.net)