Ask every question you may have regarding nationality of guests, age groups, etc. I've attended several events at embassies before and the DJ's have actually done great jobs as they've been prepared for requests from lands you'd never imagine. If you are successful at this event you've knocked the door off the frame, and as Jon and John have mentioned before you'll go into a very select group of individuals that will land events that are more expensive and elite than what regular gigs are.