Hack night is the generic networking meetup at the rusty nail. It's way more casual. No presentations or organizing. below-c-level and frontend party are generally more organized and have talks. All the meetups happen before (and geographically near) to hack night on the same night. So you can generally do both. See a meetup then walk to the bar with everyone for the networking event.

Typically every Tuesday night at the Rusty Nail bar at 7 PM. A lot of the community meets for so-called Hacknight.

Also a link on that noladevs site to the community slack. That one has been going since early Launchpad days....what? 14 years ago?