From someone who has done this for a long time, I think you may trying to run before you have really learned to walk yet. There is sooo much more involved in doing gigs like this than you may be aware of. Were I in your shoes, I would pass on this one and start small and work your way up to something like this.
Do you have model releases handy? How about liability insurance? What is someone trips over one of your power cords which you did not securely tape down with duct tape? As previously mentioned, how do you plan on selling images which have "celebrities" in them? How do you plan on getting proofs to people and collecting money? Cash, check, paypal, credit card? And keep in mind that for stuff like this you really should charge sales tax (check your local and state laws about what to do in this case), which means a business license and tax number. To do all of it without one could be setting yourself up for trouble with your state. And keep in mind, a lot of people may actually WANT prints, not just images on a CD or sent via email. You need to have answers to all of these questions and about a hundred more before you even get to "how much should I charge". You might want to approach a professional photographer who does this kind of thing for a living and go along with them on shoots like this, offering your services as a "hired hand". If he pays you, all the better, but leave that up to them. Your experience is worth a lot more than money at this point.