As you are brasilian i thought to write in portuguese, but nobody else would understand, so i´ll try to help you in english
First of all, you said that you have a MD recorder, but which one is your Mic? one of the most important things to get a good recording is the mic you´re using... plug your mic in your t-shirt and be happy...
After the mic, now there´s a problem that both of us will have, as i´ll record Maiden in São Paulo as well...
Pacaembu is such a big venue, and it will be general admission, so, it will be very dificult to stay near to the stage, and as the stadium will be full, there will be no room without ppl near us that might start screaming and ruining our recording...
So, unfornutally the position that we will get will be the one that we found out to be the best...

we´ll not have to many options..
and now that thing that i´m really, really worried and the most important... the sound. I really do not know how loud it will be there, speacilly because in the front, the sound will be loud, but as we´re gonna stay in the back, the sound there might not be as loud as it should... and the wind... i remembered Rush last year, in Morumbi, and it was a windy night, so the sound had too many flutuations...
well, i do not know if a really helped you, but, if you have any question, just PM me..
