Punk rock and rockabilly collide with a splash of Brylcreem, motor oil and black leather during Hootenanny 2011, an all-star celebration of revved up rock ‘n’ roll madness. Dropkick Murphys headline with their pugnacious Celtic punk aesthetic, preceded by rockabilly revivalist Reverend Horton Heat and L.A.'s own Luis & the Wildfires, plus the mellow sounds of John Doe and fancy swing from Royal Crown Revue. Oak Canyon Ranch, 5305 E. Santiago Canyon Road, Irvine. 12 p.m. Sat. $39-$100. thehootenanny.com.