Batman: The Movie (1966)

A Trivia post for Batman (1966) states that the movie's premiere was postponed due to the University of Texas shooting on August 1. Trouble is that IMDB lists the movie premiering two days before, July 30, and there was even a parade for it. Wikipedia isn't always reliable but it lists nothing about a postponement or the massacre on the movie's page so I'm inclined to believe that IMDB has an inaccurate trivia post.