fleeting encounters and absent-mindedly gazing audiences

I got stuck in the Northern Line this morning, 8am, on the way to work. So the conductor from within his separate space got in touch with the crowd: [tired voice] 'would the person leaning against the door please move away...otherwise I will have to check all doors, and that's going to take ages'. How was he imagining his audience, I wondered. If he was imagining us at all that is...
In front of me a lady in pink - applying make up, lots of make up to be fair. She managed to do that with a very quiet hand in the totally crowded tube, standing in move-with-the-speed mode. Impressive. Obviously, she was either used to audience, desiring 'us' as onlookers - or totally ignorant of all those around her attractive self.

Last night I discussed with a friend who wants to write a travel guide - and my own blogging experience came up. Again, audiences sprang to mind. Who are 'they' - are they groups, individuals, no names, blurred or simply a grey invisible mass?

Finally, we saw the tap show/black & white cabaret [at Inn on the Green, London], sitting on cushions in the very 1st row, in touching distance to the stage, and again: audiences. How did the performers visualise/imagine and perceive the audience/s - blurred in the shadows of a 1920s style purple/black ambience? Or did they ignore us in order to concentrate?

Audiences - who are you? Frequently also of importance, perhaps even more so: where are you?