The event marks the 80th anniversary of the caped DC Comics character and the lighting starts this Saturday at 8 p.m., more from the NY Times:
The bat-signal will be projected onto the sides of landmarks in each of 13 cities for four hours, beginning at 8 p.m. locally. A Batman Bat-Tracker clock on the DC website is counting down to the first lighting at Fed Square in Melbourne, Australia. In New York, the signal will be projected onto the former Domino Sugar refinery in Williamsburg, Brooklyn.
The other cities on the bat-rotation are Tokyo, Johannesburg, Berlin, Rome, Paris, Barcelona, London, São Paulo, Montreal and Mexico City.
The final lighting will be at City Hall in Los Angeles, the location of a bat-signal in 2017 to honor Adam West — the Batman of the camp 1960s television series — when he died, at age 88.