"We tell each other on the scene where and when we would gather next time. But mostly you know where people would gather..."

"... and you do not need to arrange anything.... We will continue until they kill every single one of us.... They fired teargas directly at us the other night, my eyes were burning, I could not sleep all night, but still I went out the next night, with my tears and pain in my eyes." 

Said one woman named Nasheen, quoted in "'Women are in charge. They are leading': Iran protests continue despite crackdowns/People, determined to defy violence by security forces and online blackout, are resorting to old-fashioned methods to organise unrest" (The Guardian).

Also, from a woman named Negar: "Much of the time the men are just watching. Women organise and do everything. It’s completely different from previous times. Women are in charge. They are leading."

ADDED: Those 2 quotes seem to present a paradox — leaderless leading. Here's something in The New Yorker, "How Iran’s Hijab Protest Movement Became So Powerful," quoting the Iranian scholar Fatemeh Shams: 

Today’s revolution is completely leaderless in the sense that none of the previous figures... are being called upon. People in the streets are not waiting for anyone to come and take the lead. They are the leaders of the revolution....

It has made it very difficult for the security forces and for the government to actually suppress this movement.... [T]hey can’t really go after a particular figure. They tried. They had mass arrests in the past few days of journalists, and of people who they thought could potentially be leaders. They did that, but the protests haven’t been shut down. They couldn’t shut it down. In fact, it has become more widespread. 

Nasrin Sotoudeh is a human-rights lawyer who has represented many of these women who, over the past ten years, have been sentenced to jail or summoned to court on the basis of not observing the compulsory hijab. She recently said this movement is leaderless and is only led by those women who are doing this one revolutionary act. And that revolutionary act is not carrying a weapon. They’re not armed. This is completely peaceful. 

And the only thing that they’re doing is they’re harmlessly taking something off of their head and they’re walking in the streets of Iran. The figure of this revolution is the body of these women, these unveiled women who are walking in the streets without harming anyone. Without even chanting “death to the dictator” or saying anything harmful against anyone. Their bodies have become the revolutionary figure of this movement....