This happens many times when your put a makeup for a wedding or a party and it gets ruined because of the sweat or because of some other problems. First of all , it is always advised to go for waterproof make up products .
This is because the waterproof makeup products are durable and on't let water or sweat ruin your makeup. It happens many a times when your eyeliner gets removed or spoiled when you dance excessively in a party. You cannot stop your self from enjoying and dancing. The key solution to this is to change your makeup product. Your makeup defines your beauty. You cannot stop going out in summers. You cannot just stop going out because of the fear of being tanned and sweat. You could simply go for sunscreen . You could also apply some home made tanning packs on your face.
Another thing is that you should never go for cheap makeup products. Cheap products lead to causing you acne and pimples.
Just in case, if your makeup gets spoiled, you could simply use a moisturiser to remove your makeup. Don't use oil to remove the spoiled makeup as it is way too greasy and could give you acne. You could go for Lacto calamine or some medicinal moisturisers. Now don't use a cloth to wipe it off , use a dry tissue or cotton instead. It is easy to use and disposable. If you wipe your wakeup with a cloth then you would get a permanent stain on it. You could also go for some makeup removers. Also, do not ever forget to wash your face with a mild soap after coming back home.