Summer fun - going away/business networking event

This was a medium sized party on 8/7/10 - 50 guests. I had 1 assistant who helped me clean and serve wine while I prepared mixed drinks and entertained:

Dear Luis,

On behalf of my organization, I’d like to thank you for your service at our business networking event. Your performance as a bartender has exceeded our expectations. We look forward to working with you in our future events.

Regards,

Bilateral US-Arab Chamber of Commerce