King & Grove Hotel in Williamsburg is opening its new rooftop lounge, Upper Elm, this Saturday featuring a pay-to-play salt-water pool ($35 on weekdays, $45 on weekends). The menu will include dishes like a shrimp tempura BLT with nori aioli, a dry-aged burger and lobster lettuce cups. Cocktails from mixologist Johnny Swet (Jimmy, Cole's) will range from the McCarren Spritzer to Mezcal Micheladas. Live DJs and acoustic performances will kick off this weekend as well. Stay tuned for more on the launch of Paul Liebrandt's The Elm which will open in the hotel's downstairs space later this summer.