ATLANTA, GEORGIA – JUNE 13: A general view of the atmosphere during Nickelodeon’s Slime City Atlanta preview on June 13, 2019 in Atlanta, Georgia. (Photo by Marcus Ingram/Getty Images for Nickelodeon) User Upload Caption: Slime City, a new pop-up experience from Nickelodeon, will open in Aventura Mall Dec. 6-Jan. 20. (Nickelodeon / Courtesy)