The festival quickly added California indie rock band Best Coast to replace Barnett.
Project Pabst will also feature Nathaniel Rateliff & The Night Sweats, Violent Femmes, Charles Bradley and more in Denver's RiNo neighborhood. The event also features a series of "night shows" across the Denver metro area.
Listen to our interview with Best Coast from last year.
And even though you won't be able to see Courtney Barnett in Denver this month, you can still watch her perform at OpenAir above!