The public will get its first look next week at the new $78.5 million Natick High School , completed on time and about $10 million under budget following two years of construction.

Residents can tour the new high school from 6 to 8 p.m. Tuesday, the night before classes begin for Natick students. The district will also host an official ribbon-cutting ceremony at 6 p.m. Sept. 25 with elected officials and local celebrities.