Chica, I was there last Saturday and you will have a brilliant time, (even if the dances/marking aren't perfect).
I was at the back so I stayed sitting during the AW "standing ovation", knowing the cameras weren't on me!
Get there early (I was there 11 ish and there were only about 30 people but it depends on the weather, I guess) - you won't have to stand in the queue for the whole time, as everyone is so friendly and so happy to be there, everyone was taking turns holding their neighbour's place in the queue while they went to the Westfield Shopping Centre across the road. Sambasue from this forum kept my place for me and kept me company as my friend didn't turn up till the very last minute!
You're welcome to PM me if you want to ask anything.