These might not be “hooks” as people traditionally think of them, but can be presented as showing qualities that people like - compassion, generosity, and leadership, for starters.
This could be your “hook” - or at least distinguish yourself from the crowd, if you have an interesting/compelling story about it. Use it in essays, if you can, and definitely in interviews.
If you’re into it because you’re tagging along with your parent, or just a member of a youth organization, it might not distinguish you. But if it’s something that you’ve taken some initiative in, or chosen to do, that might be interesting. How did you choose to become a member of the Cancer Club?
Great grades, great SSAT scores, Model UN - there are many applicants with those qualifications. You want to differentiate yourself as interesting. And I suspect you are very interesting - just let yourself shine!