An open house for eighth graders from Shelton and nearby towns is being held tonight at the Trumbull Regional Agriscience and Biotechnology Center, located at Trumbull High School. Sessions will take place Thursday, Nov. 6 from 5:30-6:30 p.m., and 7-8 p.m., at the Agriscience Center, 536 Daniels Farm Road, Trumbull. Eighth graders and their parents will learn about the regional four-year high school program specializing in animal science, floral and landscaping design, biotechnology, equine science and natural resources. The school serves students from Bridgeport, Easton, Fairfield, Milford, Monroe, Orange, Shelton, Stratford and Trumbull. For information call 452-4200.