Charli XCX Sculpts a Moment

For a select few, when Charli XCX says to make a pilgrimage upstate in the middle of the day on a Thursday, you ditch work early, try to put together an outfit that looks both “fall” and “slutty,” and then board the 12:35 Metro-North to Poughkeepsie with a final destination in Cornwall. No one said keeping up with brat autumn was going to be easy.

The event drawing everyone to the outdoor museum Storm King, an Instagram-worthy spot just three hours north of the city...