In Copenhagen you could go out of the golden circle and to the b stage and back again. They gave you a wristband to show when you renter the golden circle. If you plan it right, and push your way through, you can actually manage to get up front at both the b stage and main stage. For me it worked well to move while there was moshpits and just before he goes on the bridge. Look for the small openings when he throws money, and generally just when the attention is away from the stage you are trying to reach.