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Not camera related but if you're looking to get up close to the talent I would say; get to the front early, and invest in a decent pair of earplugs.
Also, take care moving amongst crowds, depending on the music, a lot of people will be unaware, inebriated and/or simply won't care that you're carrying around expensive equipment. Course to avoid all that hassle start writing to promoters/network with artists and try to wrangle a photo pass.