Post Malone, Panic! At the Disco & Travis Scott to Headline Firefly 2019 & Tickets Go On Sale Soon!Post Malone, Panic! At the Disco & Travis Scott to Headline Firefly 2019 & Tickets Go On Sale Soon!June 21st to 23rd is the big weekend for Firefly and many PST artist will be taking the stage. EeEEeE