Non-profits for mentoring folks from underrepresented backgrounds in tech?

I used to live in SF and years ago I would volunteer at an org called RailsBridge (now called BridgeTroll), and volunteers would host 1-day workshops teaching Ruby on Rails or JavaScript for free. They were mostly for women & people from underrepresented backgrounds breaking into tech, but some men would join and it wasn't a huge deal.

I was wondering if there were similar organizations or communities in NYC. I've heard of larger orgs like Kode With Klossy or bootcamp schools, but I was wondering if there were more local groups, non-profits, or even after-school high school programs, before I applied to volunteer TA at a bootcamp.

tl;dr: I'm a software engineer that wants to volunteer somewhere that helps other folks break into tech.