The Americans with Disabilities Act (ADA) is a law passed by the US Congress that requires reasonable accommodations for people with disabilities.... including people with hearing loss. The law requires public accommodations (primarily hotels, theaters, movies, arenas, auditoriums, and classrooms) to provide access for those with hearing loss. The ADA also makes it illegal to discriminate against people with hearing loss in job related activities (hiring, firing, and promotions).
Note that there is no automatic enforcement of the ADA provisions; it is up to you to know and understand what is reasonable accommodation and to file a complaint if you are discriminated against. It is also up to you to take advantage of the accommodations that are available. Many movie theaters, for example, offer assistive listening systems and will loan customers the appropriate receivers so they can hear the movies better, but most theaters do not advertise that they have the systems ... you have to ask.
For more information, see: