CEDAR RAPIDS — Cedar Rapids will be celebrity central this Aug. 3 to 5 when the inaugural “newbo evolve” festival brings to town Grammy winners Kelly Clarkson and Maroon 5, Reddit co-founder Alexis Ohanian, director and author John Waters, fashion stylist Carson Kressley, fashion designer Christian Siriano and woodworker Clint Harp from HGTV’s “Fixer Upper” fame.Not to mention the “Cedar Screamer,” a 1,000-foot zip line rising 10 stories to give thrill-seekers a bird’s-eye view as they zip from the NewBo District to the National Czech & Slovak Museum & Library site across the Cedar River.