But seriously, what I'd do, is do it for free, under the following conditions conditions, 1) you will feed them to the crundy if they tell anyone you did it for free. 2) you get promo photos AND links on fb 3) your there as a favor, not a human jukebox and will pack up on the spot if you get abused 4) nominate in writing a person that is financially responsible should random drunk person spill on your gear Doing things for free, or worse, cheap is the second worst thing you could do. It makes it very hard to up your price later on. Worst thing is you charge too much and they get somebody else....