>>4454230in lightroom there's a calibration panel that does wonders to salvage a photo assraped by monochromatic LEDs
>>4454245this is rally good one. try looking for details in their apparel or items they carry (this is easy at anime cons, weebs are hoarders of pins and other bulllshit) (picrel is my humble attempt at this)
>>4454232go wide, go really tight, experiment with negative space, take general shots form behind the audience, introducue more variety. in general, if pit under the stage is the only space you're allowed, there's not all that much you can do. you're lucky the stage has decent lights and it's not some local sports center with loverhead fluorescent bulbs