Every year Atlas Obscura, that compendium of the rare and esoteric, celebrates Obscura Day as way to peer into secret spaces around the globe. There are events exploring hidden nooks all over the city (including a sold-out Green-Wood cemetery tour by our very own Allison Meier). Another Obscura event of note is the rooftop camping workshop and overnight in Williamsburg. Cellphone use at the sleepover is restricted to emergencies only, so being up on top of a building, looking out over the city may just be your best chance to get away from it all this weekend. Workshop from 4pm-8pm, followed by an all-night camp out, weather permitting; tickets are $50, here.