[...]
"This rule is effective January 17, 2017. Public accommodations with movie theater auditoriums showing digital movies on December 2, 2016 must comply with the rule's requirement to provide closed movie captioning and audio description in such auditoriums by June 2, 2018. "
[...]
https://www.federalregister.gov/documents/2016/12/02/2016-28644/nondiscrimination-on-the-basis-of-disability-by-public-accommodations-movie-theaters-movie
"This rule is effective January 17, 2017. Public accommodations with movie theater auditoriums showing digital movies on December 2, 2016 must comply with the rule's requirement to provide closed movie captioning and audio description in such auditoriums by June 2, 2018. "
[...]
https://www.federalregister.gov/documents/2016/12/02/2016-28644/nondiscrimination-on-the-basis-of-disability-by-public-accommodations-movie-theaters-movie