Attention, Central Park disco skaters and devotees of Staten Island’s RollerJam USA: You’re no longer the only eight-wheelers in town. This Thursday, a temporary 8,000-square-foot open-air roller-skating rink opens beneath the High Line. The Uniqlo-funded rink, inside the food-truck-packed Lot at 30th Street and Tenth Avenue, sports a trippy geometric-print floor bordered by illuminated construction barriers and benches for onlookers. The entry fee, including skates rental, is a reasonable $10 for kids under 13 and $12 for adults, but the first 500 skaters get in free this Thursday and Friday (open Su–W, 11 a.m.–10 p.m.; Th–Sa, 11 a.m.–11 p.m.; 212-206-9922; through 9/26).