What are mashups but The Upside Down versions of songs you already know and love? So Bootie Mashup is “running up that hill” with a special themed party to celebrate the finale of Stranger Things 4. Bring your Hawkins and Starcourt Mall-inspired lewks and cosplay for a “neverending story” of mashups and remixes inspired by the show (and of course, expect lots of surprises from the ‘80s).