It also happens to be home to the best nighttime pool party called Nightswim. View the XS Event Calendar To Find Out About DJ's, Parties and Events at XS Las Vegas XS Las Vegas provides an elegant and passionate club environment that surrounds Encore's sparkling pool. XS Nightswim offers you the choice between lavish bottle service on the dance floor or luxurious cabanas around a massive pool. When it first opened, XS night swim was the first of its kind. XS night swim typically begins at the beginning of May each year, and club-goers are invited to make the move from the dance floor to the poolside for an after-dark soiree. It’s the epitome of Vegas night life in the warmer months. The most highlighted events of the season at the most successful club in Las Vegas are the XS pool parties every Sunday night in Summer. Inspired by the sexy curves of the human body. Now in its seventh season, XS night swim has become the go-to place for the best in Las Vegas nightlife. Weekly events at XS Las Vegas include the famed Sunday Night Swim. Lines may be … Inside the Encore Las Vegas, XS Nightclub is one of the highest-grossing nightclubs in the United States. Here’s a list of the top 3 nighttime pool parties in Las Vegas right now: Nightswim at XS XS has it all: top-charting DJs, large outdoor space, and even gambling areas.