IDK if anyone's still reading this, but I have a really cool skin cure.
Oatmeal. Y'know, the stuff you make porridge out of.
= This is a video tutorial on how to apply it (literally, just soak it and rub it into your skin).
And it makes your skin feel GREAT, and if you use it day and night, it will get those pimples and blackheads chased off. So it's great use for the few weeks coming up to a con, or even on the con day, since once you're done with this, your skin is just so soft and smooth, yet still firm.
It moisturizes your skin and the actually oatmeal itself gently exfoliates and clenses your skin. If your skin still feels grotty after wiping off your con-day make-up, this will get the remainder of the make-up off, stopping build-up in your pores and preventing more spots from popping up.