SATURDAY Million Trees Initiative, 9 a.m.-1 p.m., Hansen Dam Recreation Area, 11770 Foothill Blvd., Lake View Terrace. Call (818) 753-4600. Japanese Festival, 9 a.m.-4:30 p.m. today and Sunday, Descanso Gardens, 1419 Descanso Drive, La Cañada Flintridge. Free with garden admission. Call (818) 949-4200. Passport Fair, Santa Clarita Main Office, 24355 Creekside Road. Call (661) 254-3270 160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! Reagan Library’s 15th year anniversary celebration, 10 a.m.-3 p.m., 40 Presidential Drive, Simi Valley. Call (800) 410-8354. Fine Arts & Crafts Show 10 a.m.-4:30 p.m. today and Sunday, Warner Center Park, 5800 Topanga Canyon Blvd., Woodland Hills. Free admission. Call (818) 709-2097. Mail Datebook entries – including time, date, location and phone number – to Daily News City Desk, P.O. Box 4200, Woodland Hills, CA 91365; fax (818) 713-0058; e-mail email@example.com.