As a transfer student, should I add high school activites unrelated to my enduring passions to my applications?

I'm a transfer student, and I have 7 activities I feel are pretty strong for my transfer application, all from after high school graduation. All these activities fit into a couple common themes that add up to what I'm most passionate about. Should I add a couple activities from high school even though they aren't related to the passions I still have that all my other activities are related to? I just want to make sure admissions officers know I was involved in high school, especially since my high school grades aren't very good, though my college grades are. My dream school is Northwestern University.