I forgot to add two of my activities on the common application! Help!!???

Northwestern is my DREAM, and I am already borderline with my not-so-hot test scores. It is definitely a reach, but I am still trying my best! Would it be hurtful to me to write an email to someone in admissions and list my two extracurriculars? They are that I started my own bicycling club and that I volunteer every Sunday teaching religious education to first graders.