RSU 9 schools will host open houses from Aug. 24 through Sept. 9, giving students and families a chance to meet staff and prepare for the new school year. (Courtesy photo)Farmington area schools will hold open houses from Aug. 24 through Sept. 9, giving students and families opportunities to visit classrooms, meet staff and prepare for the new school year. Mallett School, 116 Middle St. in Farmington, will welcome prekindergarten and kindergarten families from 2-3 p.m. that day. Blue Middle School at 269 Middle St. in Farmington will hold an all-grade open house Aug. 26 from 5-6:30 p.m., and Cascade Brook School at 162 Learning Lane in Farmington will hold its open house Aug. 27 from 5:15-6:30 p.m. The open house for Mt.