So long, Sleep Train Amphitheatre! Welcome, Mattress Firm Amphitheatre!
Say goodbye, to Sleep Train Amphitheatre "Â not the venue, the name. Effective immediately, Sleep Train Amphitheatre "Â San Diego County's largest outdoor concert venue " will be known as Mattress Firm Amphitheatre. The venue is owned and operated by Live Nation, the world's largest promoter of concerts...