Try using a tinted moisturizer for your face, it'll even out your skin tone but still look natural. For your hair consider purchasing a dry shampoo. They can be a bit spendy but since you'll only be gone for three days you can buy a travel sized one. If you've never used dry shampoo before it is usually sprayed onto your hair much like hairspray it will clean your hair, make it appear less oily, and often times give you volume. I recommend Oscar Blandi Pronto Dry or Big Sexy Hair dry shampoo. Use face wipes at night or when you get sweaty or dirty to help keep your face clean, I recommend Olay.