Be good to have your support.
I'm not sure about the details, I assume that seeing as we have the same tickets as everyone else that you could do it. I'd just get tickets for Sat and camp and if someone approaches you then you can take it from there.
If you want to ring someone though the best bet would be to ring New Era themselves. Here is their website
New Era You may want to check about Sunday night camping though.
For C) did you mean non-competitor-wise? Lizzie is camping as well - with Mike.