Today’s announcement that the Gibson Amphitheatre on the Universal CityWalk is going dark for good puts an end to a 40-year chapter in LA concert history. The former Universal Amphitheatre was rumored to be on the chopping block amid the flurry of redevelopment at Universal Studios that begins in the summer — the venue’s lease agreement is set to expire in September. But the 6,000-plus-seat hall has struggled to consistently book big-name acts amid competition from LA Live’s Nokia Theatre, which opened in 2007, and subscription series partner the Greek Theatre; the Gibson’s 2013 schedule is heavy with international acts including Gloria Trevi, Il Volo, Eros Ramazzotti and Lila Downs. A handful of already booked post-September shows — including the 10th anniversary of the Brian Setzer Orchaestra’s annual Christmas Rocks gala — will be rerouted to other venues. Live Nation said its Southern California office will “assemble a very special lineup of shows as a fitting farewell” to the Gibson.