This event was created in Pittsburgh's Monroeville Mall about more than a decade ago. Which was inspired by Goerge Romero's film Dawn of the Dead.
Recently, more than 50 cities around the world participate in WZD including NewYork, Pittsburgh, Paris, Hong Kong, Los Angeles, Chicago, Dallas, Seattle, and Tokyo.
The main purpose of this event is to fight hunger and homelessness, through raising money for charity.
