Give the Woodstock chant, “No rain, no rain, no rain,” for RiverFest tomorrow. Events start at 12 noon with the ribbon-cutting for the Concord River Greenway Park behind the Davidson Parking Lot opposite Lowell Memorial Auditorium. Activities include bluegrass, soul, rock, and other kinds of music; kids stuff like crafts and t-shirt printing; a fashion show of clothes made from recycled materials; boat tours on the Pawtucket Canal; and more. Visit www.lowellriverfest.org for details.