Here are some tips:
Using makeup that will compliment your dress will make it stand out more, which is a good thing
Use a powder or foundation that closely matches your skin to reduce shininess
Don't wear your eyeliner too thick. Get help if you can't neatly apply a thin line of it
If you wear bright red lipstick, take the tube of it with you. Check it in a mirror throughout the night, and reapply it when needed
If you go tanning, do it a week ahead to reduce the burn if there is any
If you apply fake tanning, do it a few days before so you can be sure you have it all applied evenly
Wear waterproof mascara, just incase something happens that makes you cry