Alter Ego takes place on January 17, 2026 in Los Angeles, California, featuring a diverse rock and punk lineup headlined by Green Day and Twenty One Pilots. The single-day festival showcases eight artists including Cage The Elephant, Sublime, and Good Charlotte, spanning genres from classic punk and rock to indie pop and funk rock. Rising stars like Myles Smith, Gigi Perez, and almost monday round out the bill, offering fans both legendary acts and emerging talent. The festival brings together artists from the United States and United Kingdom for a concentrated day of alternative and rock music in Los Angeles.