Can Batman be 75 years old? The Museo de los Niños says that the Dark Knight is, indeed, and that the birthday celebration will be two days this weekend.
The museum, nicknamed the Castillo de los Sueños, becomes the Baticueva or Bat Cave on Saturday and Sunday for what is being called Baticon 2014.
Museum officials said they expected thousands, and many will be wearing appropriate Batman garb, including that made famous by a string of creative villains.
Eduardo Salazar, one of the organizers, points out that Batman represents the values of justice.
The museum says it plans to exhibit a number of models and as many as 1,500 figures of Batman produced by Mattel and Súper Héroes of D.C. Comics.
For older youngsters and adults there are forums on the history of Batman, the movies, and the history of the comics.
Batman, of course, is Bruce Wayne, the Gotham City millionaire who fights crime as his alter ego. He is among the first comic superheroes, a contemporary of Superman.
The sponsor of the event is the Club Batman Costa Rica, the museum said. There is an admission which includes access to the entire museum. The time is from 9 a.m. to 5 p.m.