Formal:
* Audience: This is the most common and general term.
* Attendees: This emphasizes their physical presence at the event.
* The assembled: This is a more poetic and formal option, suggesting a gathering of individuals.
Informal:
* The crowd: This is more casual and appropriate for large, less formal gatherings.
* The people: This is a simple and direct option.
* The listeners: This emphasizes their active role in receiving the message.
The best term to use will depend on the specific situation. For example, in a formal academic setting, "audience" would be the most appropriate. In a casual public forum, "the crowd" or "the people" might be more suitable.