You should not focus your camera on any persons on the street for photographs, without their permission. If someone is in the background, or part of a crowd, or he/she standing in front of a building in an obscure way, it's OK. Otherwise you shouldn't focus on any individual.
If somebody is visible in any photograph, please attach Personality Rights along with the photo. If you are a newbie please seek for help and write in talk page with your query to do so.
Respecting the rights of property owners: Property owners have the right to restrict you from taking a photograph while standing on their property. But, you can take any photograph as long as you are standing on public property.
If the police ask you to stop, stop.
Please Remove time stamps while taking snaps.
If you wish to leave early please inform the co-ordinator of the photo walk.
Do not leave any garbage behind. Take only photographs and leave only footprints!