Tonight at 8 p.m., my astral self will be hovering over downtown Miami as my good friends and former band mates, The Three Jacks, play a benefit concert to raise funds for victims of the 2007 Peru earthquake. The concert is being held at 8 p.m. at the Arsht Center for the Performing Arts, and I’m thrilled to report that tickets have sold out, every last one of them. Joining The Three Jacks will be champion step-dancers from the Breffni Academy of Irish Dance, in Florida. It promises to be a rousing evening of Celtic rock and Irish step dance, Miami-style. (Read Greg Baker’s article in the July 31 Miami…