Originally Posted by willravel

If you go to a demonstration in SF DO NOT WEAR A MASK. It is illegal here and you can get arrested (I've seen it first hand). Wear a hat and large sunglasses, hood, etc.

Do not leave anything at the protest. Wear thick clothing. Bring gas masks. DO NOT TALK TO ANYONE FACE TO FACE. If you see someone trying to look at your face, look away. Look down. You cannot let them get pictures of your face.

Most importantly: check your local laws concerning legal protest. SF is not the only place it's illegal to have a mask.