Some little kids just love things that go. And steam engines not only move, but also spit out smoke and a mighty scream. Some of these engines of a time gone by will be fired up at the annual Roots of Motive Power Steam Festival. Besides the engine exhibit, there also will be a barbecue of locally raised meat, and, across the street at Recreation Grove Park, a vintage car show. The festival will be held September 7–8, 9 a.m.–4 p.m., at 420 Commercial Street in Willits, with the barbecue held only on Sept. 7, starting at 4 p.m. Admission is free; the barbecue is $15. See rootsofmotivepower.com for details.