If you're in Delhi, there's a condolence meeting at Jantar Mantar at 11am.
For the rest of us:
This evening, around sunset.
If you're in Bombay, perhaps at the Gateway of India, our India Gate. Or Marine Drive, Azad Maidan, Shivaji Park, the amphitheatre at bandstand, the park near you, with your friends and neighbours.
If you're n other places, name your place to meet.
Here's what you could do.
Wear a white ribbon, or a white headband.
Bring a flower, any flower, but I suggest a rose or anything that has a thorn or two.
When you get there, use that thorn to draw a little blood from your thumb. Feel that little bit of pain. Think how much worse it was for The Girl, for the thousands of others like her who we have not heard of, may not ever hear of. Remember it. Use the white headband or ribbon to clean up that drop of blood.
Take the flower again. Pull off every petal, one by one. As you do, say to yourself, with each petal, we killed her, all of us, by never fighting the daily atrocities, by never saying, no, enough, I will not let this happen.
Crush the petals in your hand and release the fragrance. As you inhale it, say to yourself, this is where it ends. This is where I do all I can to stop it. Let the petals fall to the ground. (If you're near a river, or the sea, let the petals go into the water.) Throw the stalk in the nearest dustbin.
Sing together. Choose something you all know. Perhaps 'We shall overcome / Hum honge kamyaab' could be it. Sing it soft.
Disperse. Go home. And start changing our world.