Augusta Ada Lovelace is known as the first computer programmer, and, since 2009, she has been recognized annually on October 15th to highlight the often overlooked contributions of women to math and science. The main event is being held today at Imperial College London, with the début of an anthology of essays, “A Passion for Science: Stories of Discovery and Invention.” “I started to think that one of the biggest parts of the problem was that women in tech are often invisible,” Suw Charman-Anderson, the founder of Ada Lovelace Day, told me. After reading a study in 2006 by the psychologist Penelope Lockwood, who researched the dearth of female role models in the sciences, Charman-Anderson thought that a fête for Lovelace could raise awareness of her noteworthy successors. This year, dozens of celebrations will be thrown around the world, including an “Ada Lovelace Edit-a-thon” at Brown University, where volunteers will ramp up Wikipedia entries for female scientists.