Halloween might not be until Thursday, but it’s really a week long series of celebration for New Yorkers. The fun started Saturday night when The Byrne Notice and Emerson hosted a “sick” party at Mister H. Derek Blasberg, Fiona Byrne, Joan Smalls, and Bernard Smith (pictured here) joined Jason Wu, Rebecca Minkoff, Alexa Chung, and all the cool kids for some tricks and treasts. As usual, the fashion set knows how to do Pumpkin Day correctly. Props to Byrne on her hilarious McDonald’s uniform, we’ll take some fries with that! For more photos from the night, The Byrne Notice has you covered.