The Regency Live is bringing Brat summer to downtown Springfield. On Sept. 21 at 9:30 p.m., the Regency will be hosting This is not a Brat Rave, an event centered around pop music and featuring hits from trending artists like Charli XCX, Sabrina Carpenter, Chappell Roan, Billie Eilish, and more. The show will be a 16-year-old and over event.