I think there's still people hacking around doing cool stuff.
Things like PICO-8, etc.
It's much harder to throw a big party these days in general, and especially so about technical niches. Hack Club is popular with youth, but much more about smaller gatherings.
PICO-8 is super fun way to explore the joy of constraints.
Over the summer, we hosted a vibecoding PICO-8 game jam in Amsterdam. It wasn’t a demoparty but we nevertheless had some amazing demoscene folks show up with c64s and example demos. We attracted a handful of teenagers and had nearly equal gender balance—and made some really creative games. We definitely experienced some hateful online vitriol about vibecoding (eg “you are the human equivalent of cancer”) but that was to be expected—this event was almost deliberately about the tension between deep understanding and rapid iteration cycles. I found the tension between vibecoding and demoscene to be really enjoyable and productive.