General congregation:
* Assembly: A group of people gathered together for a specific purpose.
* Gathering: A group of people coming together in a particular place.
* Meeting: A formal or informal gathering for discussion or business.
* Convocation: A formal gathering of people, especially for a religious or academic purpose.
Religious congregation:
* Congregation: A group of people assembled for religious worship.
* Church: A building for religious worship, and often used to refer to the group of people who worship there.
* Parish: A geographical district with its own church and congregation.
Specific types of congregation:
* Audience: A group of people gathered to watch or listen to a performance or presentation.
* Crowd: A large gathering of people, often in a public place.
* Convention: A large gathering of people for a particular purpose, often related to a specific industry or profession.
* Rally: A public gathering to express support or opposition to a particular cause.
The best word to use will depend on the specific context.