If i forgot to mention the audience at all in the my essay, how many marks is automatically lost?
Well i somewhere wrote that the readers, 'aspiring volunteers' were aroused etc... but i dont think thats enough ..
If you talked about the effect to some extent, then you should be alright. I don't really see how you could do an L.A. without at least implicitly referencing the audience, and just because you didn't have a phrase like 'This impels the audience to think/feel/believe...' doesn't mean you weren't discussing the effects of language in some way.
Though if you called them 'readers,' then a snarky assessor might get annoyed with you

They wouldn't penalise you hugely though; there are no 'insta-lose-4-marks' factors because marking is holistic, meaning they look at your piece overall and say 'this feels like about a 7/10 or so.' There are formal criteria, but none of them state 'students must use the word 'audience' 3 times per paragraph' or anything that restrictive.
So if we only refer to one audience (instead of the three) are we immediately barred from upper range? In the same way forgetting the visual/s restrict you to about a 6 Max (at least according to my teacher). Like can you make up for it in other ways?
Another thing was I analysed how the audience clapping and cheering promoted togetherness and all that, but my mate says I'll be penalised as the clapping isn't really part is the speech- is this an issue?
Since the multiple audiences thing was really only brought up by a line and a half in the background info, I can't imagine them using that to split the state this year. There's no requirement to discuss different levels of effects (ie. this technique would affect those present at the speech in
this way, whilst also affecting those watching the broadcast in
this way.) That might've been good in some sections, but the focus is on the language, and dealing with the effects is more like the third or fourth step in that process of spelling things out. You certainly wouldn't be limited to <6 or anything like that. Again, holistic assessment is your friend here - if your analysis is worthy of a certain mark, the things that your piece is missing might amount to a mark or two lost overall, so it's not as though there's a one-to-one correspondence between the components of your essay and your mark out of ten.
Re: clapping, I probably would've left it alone since it's not really a part of the writer's use of language, though you could say the way the speaker invites applause (esp. with that drawn out "And the winner is..." bit just before Mathew's speech) and thus fosters excitement etc.
Then again, they've put that in there for a reason, so you won't be penalised for discussing it. But it might be one of those little things (like someone analysing the fact that the word 'volunteers' was in bold in the first image) - true, and with plausible justification, but not necessarily within the scope of the task. So long as you didn't base an entire paragraph around that single point, and you were able to back yourself up well with the rest of your analysis, you'll be totally fine.