After the Cannes Film Festival wrapped up on Saturday, celebrities and fashion editors spent the first week of summer partying in various corners of the globe. In Istanbul, Waris Ahluwalia and Franca Sozzani mingled at the IST. Festival Gala, while Anna Wintour jetted out to London to celebrate The Elephant Man with Bradley Cooper and Joan Collins. Meanwhile, Solange looked dazzling at the launch party for Veuve Clicquot “Rich,” and Uzo Aduba stunned on the red carpet at the Designing Women Awards Gala. Back in New York, Mariah Carey performed at the opening celebration of One World Observatory, and Tina Brown, Diane von Furstenberg, and Helen Mirren raised a glass to Tony-nominated director Stephen Daldry. Jenna Lyons threw a book-launch party for Amanda Brooks, and Lauryn Hill celebrated her birthday in New Jersey. Click through the slideshow for these and more highlights from the week’s best parties, including Vivienne Westwood, Tracee Ellis Ross, Viola Davis, and more.