When you head to a festival you want to hit the ground running. You want to look like a movie star, drink like a rockstar, and stay model flawless throughout the day.
In my experience, in order to stay flawless in the desert you can't cake it on (or it will melt off). There is no time to touch up, redo, or wash off. Take note from some of these looks for inspiration.
You need:
Tinted moisture with SPF (my favorite
 here)
SPF setting powder (my favorite 
here)
Concealer (my favorite 
here)
Bronzer (my favorite 
here)
Blush (my favorite 
here)
Highlighter (my favorite
 here) 
Waterproof Mascara (my favorite 
here)
Gold eyeshadow (my favorite 
here)
Face & Body Paint (my favorite 
here)