We don’t recommend the swordfish tonight. How about sword swallowing? New York City nightclubs are raising their game this spring as they look to revive the post-pandemic scene with over-the-top entertainment that includes sword swallowers, belly dancers, magicians and “next-level pole dancing.” Wonderland, a nightclub and “adult” venue that opens this Wednesday in the Flatiron District, is beckoning guests with a human blockhead to go with their charcuterie plates and Wagyu cheeseburger sliders. Jewel Thief, a speakeasy in Manhattan’s NoMad District, is offering up belly dancers to electric violinists. And Keys & Heels, an Upper East Side speakeasy, has tapped a trio of magicians to work the tables. Olivur Yu, a show producer who is providing the talent for opening night at Wonderland, has booked fire eaters, jugglers of axes and swords and avant-garde variety shows with drag and pole-dancing artists who use truck chains instead of silks. “There are some shocking moments. The acts are very tough,” Yu said. “People are risking their lives and their physical well being to create their art. This is full-body dedication.” One of the sword swallowers is 36-year-old La Reine the Thrill, 36, of Brooklyn, who (it hurts to even write this) also will be inserting unusually long objects into nasal cavity. At Wonderland – a 10,000-square-foot space at 20 W. 20th St. that seats 150 people over two floors – the entertainment also will include celebrity hosts, live DJs and entertainers. The acts will become increasingly “adult” as the night goes on, says Wonderland’s creative director Richie Romero, also of Nebula nightclub and other eateries.