“Superheroes in Gotham” explores the birth of comic book superheroes in New York City, their the leap from the page into radio, television, and film; the role of fandom, up to and including the annual New York Comic Con; and the ways superheroes from the 1930s to the ‘60s influence today’s local comic book artists. New-York Historical Society, 170 Central Park W. at 76th St., through Feb. 21. Information at NYHistory.org.