Northborough – Cornerstone Academy, 5 Oak Ave., Northborough, will hold an open house Friday, Feb. 26 at 9 a.m. Cornerstone Academy is a private, coeducational school for children in grades K-6. Through small class sizes and individualized instruction, the school offers an academically challenging environment that utilizes a blend of traditional and innovative teaching techniques, such as hands-on teaching models to reinforce concepts and experiential learning through experimentation and field trips. Visitors will have the opportunity to tour the school and meet faculty and administration. For more information, visit www.cornerstoneacademy.org or call 508-351-9976.