My observation is that we were just bored a lot. It has been a long time since young people have been as bored as we were back then.
Totally different decade, but my 90s high school experience was very similar to the movie Dazed and Confused. It’s odd how similar those experiences were versus what has come with the tech disruption of youth.
Eh, I think it depends more on the location, than anything else. I grew up rural, we did basically exactly the same thing as you described, hosting raves in the forest, beaches and what not until we get word that police was on it's way (tiny place, everyone knew everyone, police coming was big news as we didn't have local police).
We did have cellphones, the internet and more, but still, we were bored and dancing all night in a forest was the most fun we could have :) This was between around 2008-2011 sometime.
Things like Flickr was a social site that had absolutely no impact on anyone’s behavior. There was no FOMO because it was just something you browsed at your own pace. Async web forums and email became synchronous chats. The phone started spending more time in your hand than your pocket.
Even things like streaming television wasn’t a binary but an evolution. Netflix streaming started in 2007. It wasn’t until 2012 they became a producer and started the binge phenomenon by releasing a full series all at once. Those first five years practically didn’t matter for Netflix. Many people saw no advantage over the traditional DVD shipping service. Once binging began people were jumping onto the streaming service in droves. It still took a few more years to really reach a point of saturation. Then, there was massive cord cutting and birth of the streaming service landscape of today that is heavily fragmented. But also provides an unlimited supply of entertainment that keeps people appeased and out of meatspace.
These still exist! Look for events promoted as such, or look for smaller local events for the genres you're interested in - the latter might not ban phones, sure, but the vibe is still what you're seeking. Nobody's recording you.