The Fashion Week crowd still may be out and about — or recovering — from the London and Milan shows, but for most celebrities, the partying is back in full swing. Yesterday, Scarlett Johansson, Zosia Mamet, and Tavi Gevinson headed to the New York premiere of He Named Me Malala, and later that night, Public School and DKNY designers Dao-Yi Chow and Maxwell Osborne danced and sang for Details’s 15th anniversary party, which also brought out Lance Bass. In L.A., Adrian Grenier, Gabourey Sidibe, and Alicia Silverstone partied for the new social platform called Go90, and in London, Selena Gomez treated a crowd, including Lindsay Lohan, Charli XCX, and Suki Waterhouse, to a private dinner and performance. Click through the slideshow to see those highlights and more from this week’s parties, including Oprah, Drew Barrymore, Hari Nef, and Neil Patrick Harris.