Academic
The pre-first grade kindergarten students have opportunities to participate in dance classes after school.
The Seisen After School Activities program (SASA) for elementary students runs for about two ten week sessions, one before Christmas and one after. Each activity usually lasts one hour from 3:30 pm. Activities offered by teachers have included pottery, T-shirt design, cookery, jazz and tap dance, calligraphy, art, painting, crafts, origami, netball, tennis, dance, computer, guitar, Spanish, French, and quilting.
Seisen takes an active role in all fine arts competitions and festivals for students in grades 7-12. Secondary school after-school activities include debate, speech, drama, brain bowl, MUN (Model United Nations) and math field day. Students who participate in co-curricular academic teams are eligible for academic letters and letter jackets.