“This is a lot of Alpha energy to wrangle,” Guster’s Ryan Miller said in testament to Alex Levy and the Cabin Down Below Band’s work last night. “This is a hard thing to organize.” And that’s probably true of most every tribute concert of this nature, as it has probably been true of the decade of Petty Fest’s preceding last night’s. But for this debut Los Angeles installment, the nature of those Alphas was distinct, peculiar, and fitting the environment. The NYC jam last month had Devendra Banhart. Last night had Johnny Depp in a feathered hat for six songs. Also it’s cool how you learn certain things about smoking in California venues when Johnny Depp comes to your show, like how it’s totally prohibited, unless you are onstage, and wearing a feathered hat, and called Johnny Depp. Aspirational loophole for you cloves smokers out there.