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Watertown Family Network, a group that offers information and services to local parents and caregivers, will hold a fair Saturday to provide information about early childhood programs, preschools, day-care providers, and other organizations. The event will take place at Watertown Middle School, 68 Waverly Ave., from 9:30 to 11:30 a.m. Immediately following the event, children’s musician David Polansky will perform a free family-friendly concert. For more information, call the Watertown Family Network at 617-926-1661 or e-mail firstname.lastname@example.org.