Father's Day
Father's Day was not celebrated in the US, outside Catholic traditions, until the 20th century. As a civic celebration in the US, it was inaugurated in the early 20th century to complement Mother's Day by celebrating fathers and male parenting.
After Anna Jarvis' successful promotion of Mother's Day in Grafton, West Virginia, the first observance of a "Father's Day" was held on July 5, 1908, in Fairmont, West Virginia, in the Williams Memorial Methodist Episcopal Church South, now known as Central United Methodist Church. Grace Golden Clayton was mourning the loss of her father, when in December 1907, the Monongah Mining Disaster in nearby Monongah killed 361 men, 250 of them fathers, leaving around a thousand fatherless children. Clayton suggested that her pastor Robert Thomas Webb honor all those fathers.
Children's Day
In 1996, author Pat Mora, after learning about the annual Mexican tradition of celebrating 30 April as El día del niño, the Day of the Child, proposed an annual celebration in the U.S. of El día de los niños, El día de los libros/Children's Day, Book Day, thus honoring children and connecting them to literacy, essential in a democracy. Assistance starting this community-based, family literacy initiative was provided by REFORMA, the National Association to Promote Library & Information Services to Latinos and the Spanish Speaking. Often known as Día, because it is both a daily commitment and an annual April celebration, Children's Day, Book Day, has grown to link all children to books, languages and cultures. A major partner is the Association for Library Services to Children (ALSC), a division of the American Library Association (ALA). Every year, across the country, hundreds of libraries, schools, and community organizations, etc. hold culminating April Children's Day, Book Day celebrations that unite communities, creating an annual tradition much like Mother's Day and Father's Day.