A friend of a friend once took us along to a Yelp Elite meetup / party. It’s what I imagined a Twitter party might be like, along the lines you described, if Twitter had a way of collecting cliques together IRL and letting them socialize.
I use to go-to IRC parties in the 90s. I remember my first one being a really odd mix of people. from button down conservative suit types to people literally having sex in the living room in front of everyone. the common denominator was a random IRC channel. it opened my eyes to the people behind the scrolling text.