The chalk walks were first organized by the association Hollaback! They consist in writing messages about street harassment directly on the ground. Those messages can be general “advices” towards harassers such as “stop telling me to smile” or examples of the sentences victims heard in the street. This type of event is easy to organize, can take place everywhere and everyone how want to can participate.
The chalk makes it extremely temporary : a simple rain shower can erase it. The fact that it takes place in the street also drives the public attention on the participants and some got harassed during chalk walks.
Several events of this type have been organized by Stop Street Harassment, Hollaback! and Stop Harcèlement de Rue.