Ask HN: How can I find hackathons post-college?

Throughout college I participated in many hackathons throughout the college circuit (HackNY and other HackerLeague events). But now that I have graduated, I want to continue to participate in them. I have done extensive google searches to find aggregated lists and have found some listings but not too many. Anyone have any tips, lists, or sites that they check? Also, I'm in NYC.

Thanks!