On Tuesday in Beverly Hills, stars ranging from Carrie Brownstein to Ozzy Osbourne to Vanessa Hudgens found themselves at the same party to celebrate the fashion marketing firm the A List’s 15th anniversary. That same night in Malibu, Kim and Khloé Kardashian dined with Kris and Kylie Jenner in honor of their next venture: a Kardashian-Jenner app. At Wednesday’s opening dinner for the 72nd Venice Film Festival, which kicked off this week, Alessandra Ambrosio twirled among the actors in a lacy gown, and elsewhere in the city, Miu Miu’s dinner for its Women’s Tales series drew Dakota Johnson, Franca Sozzani, and a customarily covered-up Sia. Click through the slideshow to see all that and more from this week’s parties, including Mandy Moore hanging out by a water cooler and Alan Cumming taking a selfie.