THE FUSE

Beaches across America and islands across Europe are packed, which means cities are a little more vacant — but don’t mistake a slow week for a boring one. More often than not, late-August parties are the most riotous. The end-of-summer, back-to-school feeling lends itself well to everyone letting their hair down and having fun. We have dispatches from a Hollywood rooftop, the grounds of the US Open, and a book launch that turned into a dance party. Keep scrolling for a hit of heavy-flash dopamine.