Write an article exploring how Millennials and Gen Z are transforming social gatherings, using the Seattle Happy Hour event as a case study. Discuss how integrating technology enhances attendee experience and promotes engagement through social media updates. Emphasize the importance of flexibility in attendance, allowing for late arrivals and cancellations to foster participation. Highlight the need for inclusive environments and clear themes to create meaningful connections. Finally, suggest methods for gathering feedback post-event to continuously improve future gatherings.