The problem with the LX3 will be the lack of zoom....cropping the pic to make Mr Bono the subject of the pic will highlight the noise.....but I'd be surprised if you were allowed in Wembley with a dSLR.
As has been mentioned...use spot metering. I imagine U2 will be well lit so low shutter speeds won't be so much of a problem. I'd shoot at various settings to see what comes out.
Here's a fullsize un tampered with shot I took with my LX3 at a gig of my favourite songstress at the ULU....maximum zoom (60mm!!
) f2.8, ISO 400, 1/40 sec....it looks reasonable when viewed as a whole fullscreen but doesn't really stand up to viewing at 1:1 thanks to the noise as she's such a small part of the pic.....but hey it's a great memento from an enjoyable gig...which is what I was after.
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