The familiar shape will illuminate the sky above cities across the world on Saturday, which is Batman Day, the caped crusader’s 80th anniversary.
Friends of the DC Comics superhero can gather outside at 8 p.m. local time to see the signal flash in the “dark knight.”
Here are the cities where you’ll see the call to action.
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Batman Day is celebrated every year on the third Saturday of September in honor of the Dark Knight. Other festivities are happening Saturday, including a signing and panel discussion by Batman writers in New York and a Batman 5K night run in Los Angeles.