It marks the birthday of Herculine Barbin, a French intersex person whose memoirs were later published by Michel Foucault in Herculine Barbin: Being the Recently Discovered Memoirs of a Nineteenth-century French Hermaphrodite.
The event appears to have begun on November 8, 2005, as Intersex Solidarity Day, following an invitation issued by Joëlle-Circé Laramée, then Canadian spokeswoman for Organisation Intersex International.
[1] The Organisation invited organisations and groups and individuals to show solidarity by marking: the life of Herculine Barbin, or discussing intersex genital mutilation, "the violence of the binary sex and gender system" and/or "the sexism implicit within the binary construct of sex and gender".
Linda Burney, a Member of the Legislative Assembly, also commended Organisation Intersex International Australia as part of a motion noting the day.
[4] In 2014, Literaturhaus Salzburg, Austria, was the venue for an Intersex Solidarity Day event.