How can i see Coldplay up close at Lollapalooza this year?

im going to lollapalooza this year, because im probably the biggest
Coldplay fan in the world. im dying to be up at the front barriers to
see them. how can i make sure im there in the front? should i sit at
the stage all day? they perform at 8:30. whats my best chance of
getting to see them from the very front?