Raf Willems/Corbis Unreleased/Getty ImagesVegas pool season is in full swing in May, and this month the city welcomes a new entrant into the dayclub space just in time for Memorial Day weekend. May also brings a ’90s favorite to the Sphere, the WNBA champs back in action, and the 30th anniversary of a legendary electronic music fest. Here are four events you’ll want to check out in Vegas this month.Belt Out ‘Don’t Speak’ At The SphereKevin Carte…