The Punk Rock BBQ was based for many years at the West L.A. bar Liquid Kitty, but it has more recently been held at Santa Monica blues club Harvelle’s. As always, though, the afternoon shows are free and generally feature veterans from the early punk-rock scene. Today’s lineup includes such South Bay luminaries as Lawndale, who take their surf-music instrumentals into unpredictable sonic spaces, and Mike Watt & the Secondmen, a hard-hitting bass-drums-organ trio with Pete Mazich and Jerry Trebotic. The show is highlighted by a relatively rare set from The Last, the Hermosa Beach band whose late-’70s collisions of power pop and punk influenced such seemingly unrelated acolytes as The Descendents, The Bangles and The Gun Club. The Last’s poignantly bewitching early single “She Don’t Know Why I’m Here” is often covered onstage by Watt. Plus, Pedal Strike and Herbert.