200. That's a big number. How many MUA's will be working it? Any extras like false lashes and glitter will add too much time to the process. And it's an extra expense that will go to waste. If the organizer is going to donate all the make-up, I would leave yours at home! You're not getting paid for this gig, nor are they giving you a kit fee. Plus they even suggested not to bring your kit. Make-up is expensive. You'll just be wasting it, and where are you going to get the money to replace your make-up from this gig? Expect between 20-30 min per girl. Teenage acne is a witch to cover up. Don't vary the looks too much or let the girls tell you what they want, if you do, expect 60 min for each request. Add that time to 200 girls... Then there are the touch ups that need to be done near the start of the event. With a big number like that, keep things simple, concise, and quick to make things easy for you. It's also unhygienic to use the same brush(es) on different girls. Make sure you have lots and lots of brushes and a brush cleaner to clean them as you go.