International Day of Families 2021: Date, theme, history, and significance International Day of Families 2021: Date, theme, history, and significance International Day of Families is an annual observation of the United Nations on May 15. Read about the theme, history, significance of International Day of Families 2021. advertisement International Day of Families is an annual UN observation. International Day of Families is annually observed by the United Nations across the world on May 15. The day is commemorated to highlight the important affairs central to the welfare of families, such as health, education, gender equality, rights for children, and social inclusion among others. The prolonged Covid-19 pandemic has demonstrated the significance of digital technologies in spheres like work, education, and communication. It has also led to an acceleration in technological changes that had already been in the pipeline for society and at work including the increased use of digital platforms and related technological innovations like cloud computing and the use of big data and algorithms.