The roots of International Childfree Day are based in an event staged by the National Organization for Non-Parents in the early 1970s. They selected a male and female non-parent of the year, with the winners parading down 5th Avenue in New York. Forty years later International Childfree Day was set up in honor of this event, with the idea being to celebrate those people that specifically choose not to have children.
A Childfree Man and Woman of the Year are selected to celebrate the day and those that want to get involved can nominate a person for this award. The details of how to do this are given on the official website and a panel of judges chooses a male and female winner from the candidates. These are announced on the day itself, with the chosen man and women receiving a few small prizes in honor of their award.