Two Waltham Fields Community Farm members are hosting a day of urban homesteading lessons at their Medford home Saturday from 2 to 5 p.m. The event will feature tips on seedling and salad greens production, raising backyard chickens and bees, and rainwater catchment for use around the home. Preregistration is required; the address for the how-to event will be sent directly to those who sign up. A suggested donation of $5 per person, or $10 per family, can be given at the event. The rain date is next Sunday. For more information, visit www.communityfarms.org.