Which annual brewing event has taken place on International Women's Day since 2014?

International Women's Collaboration Brew Day has taken place on International Women's Day since 2014. The annual event brings women brewers together to make a beer around a shared theme while raising awareness of women’s work in the brewing industry.

The idea came from Sophie de Ronde, a Project Venus member who contacted the Pink Boots Society in 2013 about creating a unified brew day. The first event followed on 8 March 2014, when more than 60 women in five countries brewed a pale ale called Unite.

Participation and recipes evolved over time: the 2015 collaboration produced a Unite red ale, and the 2016 beer was a gose. By 2018, 126 women brewers were participating. Pink Boots Brew Day is a related initiative and a tempting wrong answer, but the event named in this question is International Women's Collaboration Brew Day.