"I think right now it has to be the safest school in America," Monroe police Lt. Keith White said.
Teachers attended staff meetings at the new school on Wednesday morning and were visited by Gov. Dannel P. Malloy before the open house, White said.
Robinson said Chalk Hill School has been transformed into a "cheerful" place for the surviving students to resume normal school routines. She said mental health counselors continue to be available for anyone who needs them.
During the open house, Alvarez said his 8-year-old daughter also got to pick out a stuffed animal to take home from the school library.
"I'm not worried about her going back," he said of his daughter Cynthia. "The fear kind of kicks back in a little bit, but we're very excited for her and we got to see many, many kids today. The atmosphere was very cheerful."
On Thursday, the school district encouraged parents to let their children take the bus to help them return to familiar routines. It said parents who wanted to stay close to their children could visit after the 9:07 a.m. opening and would be welcome in classrooms or an auditorium throughout the day.
Several signs welcoming the Sandy Hook students to their new school were posted along the road leading to the school in a rural, mostly residential neighborhood. One said "Welcome Sandy Hook Elementary Kids," while a similar sign added "You are in our prayers."
Teams of workers, many of them volunteers, prepared the Chalk Hill school with fresh paint and new furniture and even raised bathroom floors so the smaller elementary school students can reach the toilets. The students' desks, backpacks and other belongings that were left behind following the shooting were taken to the new school to make them feel at home.