Drag world supernova Alyssa Edwards is performing at the Rock Box this Saturday — and San Antonio is about to be thoroughly entertained. Edwards is slated to perform her Glitz & Giggles show supported by a full roster of Alamo City drag performers, the venue’s Facebook event states. The DFW Metroplex-based headliner will deliver a “gag-worthy” opening and closing number to showcase her dance skills, according to the Rock Box’s online tease.