Alamo Drafthouse, the Austin-based theater chain, is taking steps to increase security during screenings of the film. Landmark Theaters, a chain that services 56 theaters, has banned cosplay entirely for the film, for both guests and employees. The film premiered in Los Angeles last night and will be hitting theaters on October 4th. Its worth noting that no credible threats have so far been identified, but no threat or concern has been made. Theaters will have additional security personnel present at each location for opening weekend for the comfort of staff and guests.”]
Source: https://gizmodo.com/at-least-one-theater-is-increasing-security-for-joker-s-1838596608