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An assembly of listeners or an assembly of spectators is use of the collective noun, assembly.
The collective noun for listeners is an audience of listeners.
audience
audience
The assembled spectators or listeners at a public event, such as a play, movie, concert, or meeting.
A group of spectators are called an audience.
A group can still be diverse in terms of characteristics such as age, gender, or background. The people attending a football game can still be considered a group based on their shared interest in the game, even if they vary in other aspects.
No. It's just the plural form of a singular noun. If you said 'a group of spectators' the word group would be a collective noun.
spectators
The eight letter word that is a collective noun for listeners is an audience of listeners.
spectators
An audience.