If you'd been traveling down Valencia Street on Sunday afternoon, you might have seen a 100-boomer-long procession snaking down the sidewalk in the light drizzle, its umbrella-toting occupants looking halfway like mourners. As one among the age 50-, 60- and 70-and-up gathered, I can verify: Our line was not for a funeral. On Sunday, though, between the setlist, the 400-capacity room and the 3 p.m. start time, well, this was a one-of-a-kind Van Morrison show. That much was evident after he took the stage and - just two minutes into set opener "Kidney Stew Blues" - Morrison turned to his seven-piece band, and ... cracked a smile and laughed?!?