Most Cathar bonnefemmes seem to have gathered in small communities and schools, entirely separate from men. They lived together, worked together (mostly in textiles, it seems), and studied together. This was also where they taught potential new bonnefemmes along with other women who simply came to learn from them. They also used these communities as a home base when they went out in pairs to talk to people. Possibly the most famous, was the one founded by Esclarmonde de Foix and her sister-in-law Philippa.
The Cathars didn’t tend towards large gatherings or dramatic preaching. Instead, people tended to gather in small groups in private homes to listen to a pair of bonhommes or bonnefemmes speak. Before the Albigenisan Crusade, when the Cathars were peacefully integrated with the rest of the local population and generally left alone, bonnefemmes seem to have mostly spoken to small groups of women in their homes. Once the persecutions began, they continued to preach mostly in homes, but were more likely to speak to small groups of both men and women and bonnefemmes began to more frequently perform the Consolamentum ceremony that made one a bonhomme or bonnefemme, where before it was mostly done by a bonhomme if possible. They did this in hiding, at risk of persecution. As the Cathars died out, so too did their bonnefemmes. The last known Cathar Goodwoman, Stephane de Proaudes, staunch in her refusal to convert from Catharism, was given over by the Inquisitor Bernard Gui to be executed for heresy in the early years of the 14th century.
*Most Cathars as far as we can tell anyway. This was not the most cohesive or organized of religious groups, so there seems to have been a fair amount of diversity of belief.
Brenon, Anne. "The Voice of the God Women." In Women Preachers and Prophets through Two Millennia of Christianity, edited by Beverly Mayne Kienzle and Pamela J. Walker, 114-133. Berkeley: University of California Press, 1998.
O'Shea, Stephen. The Perfect Heresy. New York: Walker Publishing Company, Inc., 2000.
Cathar Beliefs - Cathar.info