Chef Archive

I've been offered to help out with a party, by serving as the Bartender, as in people will come up to me, ask for a drink, and I make it for them.

What I'm wondering is, how much is a resonable price to charge for my service? The actual cost of food and resources will be done seperatly. But what is the worth of a Master Chef and a couple of hours of his time? Any input would be appreciated.