What to wear: There are a few versions of Eleven you could be (Government Prisoner Elle, Hamburger-Eating Elle, etc.), but let's stick with the most recognisable. If you're not planning on shaving your head (pause and think about how much time it'll save you in the morning before deciding), get yourself some kind of flesh-coloured skull cap or a bad blonde wig. Then, find a high-necked baby-pink dress with a white collar, a blue jacket, striped knee socks, white Converse, and a chunky black watch. As a bonus, dribble some fake blood out of your nose and carry around an empty box of Eggo waffles.
How to act: Since Eleven barely speaks throughout the series, you're off the hook for having to say anything out loud until 1 Nov. Practice staring intently and trying to move things with your brain (and be sure to let us know if you succeed).