They weren’t writing lesson plans or grading papers, but many teachers at a north Forsyth elementary school came to work Tuesday.They and their families volunteered to prepare and serve a free Thanksgiving meal for the Chestatee Elementary community. Fifth-grade teacher Craig Ahrens first had the idea for the school community meal last year. He said only about 10 students and their families ended up coming to school for lunch in 2011, but another 20 or so families received meals via delivery.