Project YouDoYou, Mindshare North America’s and GroupM’s first-of-its-kind, teen empowerment initiative, fashion designer Rebecca Minkoff and global media company POPSUGAR are hosting an inspirational event to fuel positive, cross-generational conversation focusing on teen female activism. Fashion designer & founder Rebecca Minkoff, POPSUGAR Executive Style Director Dana Avidan Cohn, 20-year-old social entrepreneur Nadya Okamoto, and youth…