In the fall and spring, 8th grade students that meet St. Margaret Mary chapter criteria are invited to apply for admission to the National Junior Honor Society. Seventh grade students are invited to apply in the spring. A selection committee reviews applications to identify students who embody the traits of scholarship, leadership, character, and service to others. Inductees collectively decide on a service project to benefit the school community and carry out the task. The SMMCS chapter has a brown bag lunch meeting twice a month.