Europe is a given but I hear Asia is popping off too. I have friends in Oceania who do some work around the scene. Really it's all over the world, people never stopped partying it just goes a little more underground here and there
I'll reraise you any decent size college town in the US as well.
Heck, I'm in Iowa and there's plenty of raves in the middle of nowhere here.
I think I'm at the age where I'm more interested in participating as someone actually creating part of the entertainment if I'm going to feel like I'm having the best time though, I think that's probably the best way for anyone to get into it. Lots of volunteer opportunities at festivals and of course paid gigs you can do. If you're a programmer, maybe getting deep into visuals is a way you can have some fun contributing too.
There are raves happening in warzones and even places you think there would be authoritarian crackdowns like China
With dB festival gone, do people just hit up showbox or monkey loft shows and try to make friends?
As an oldster who has only recently gotten into edm, I am clue free on where to begin finding anything underground and mainstream venues suck.
Figure out who your local promoters are, & follow their socials also.
Go to a youth focused cafe or skate park, look at what event posters are being posted on the walls? Unsure if the kiddies still post bills for small events, honestly everything is on social media these days, and is where you should start once you've identified some names.
In my city, facebook is the most reliable way to discover events - we have very active promoters in the main '$city $genre scene' public fb groups.