Katie Holmes and Joshua Jackson met nearly three decades ago on the seminal teen drama “Dawson’s Creek,” which launched them and their co-stars, James Van Der Beek and Michelle Williams, to global stardom. When Holmes and Jackson reconnected all these years later on “ Happy Hours ,” a romantic dramedy that premieres Saturday at Tribeca Festival , they weren’t prepared for the public to be so invested in their reunion. Sure enough, TikTok was flooded with videos from fans who caught wind of the