^ agreed.
if you want to get to know people that exist within a certain scene, i think one obvious way to approach it is to get involved in that community in some way.
i don't know anything about you, but working at festivals in some capacity can help you network within that community - my social circles have been related to music (in various forms) for many years, and that's been incredibly fruitful for me over the years.
lots of people work at festivals - behind the bar, putting on wristbands, support crew, security - or whatever else.
better yet - learn to dj.
you just have to find a way to engage rather than be on the outside looking in.
what that means for you, and how you can do it depends entirely on you.
i make friends at festivals by being the life of the party - dancing and enjoying myself and having the best fucking time of anyone there.
good vibes, happy vibes, fun vibes are attractive. everyone wants to hang out with the people that are having a ball.
the thing with festivals (obviously it depends what type of festival, and if it is part of a wider scene or music/subcultural community) is that they're not always ideal places to make social contacts because pretty much everyone there is just a punter who has bought a ticket and turned up hoping to have a good time.
it depends on the festival and the scene, obviously, but if i is some one-off festival or something that happens once a year, then your chances of connecting with a community associated with it are probably pretty slim.
i used to go to trance parties (called "bush doofs" in australia) which had a fairly tight-knit community where i met lots of people, but they were semi-regular occurrences with a social scene of people that were friends and houemates and stuff with other people in that scene.
it's not the same with bigger festivals - unless you are one of the DJs, organisers, promoters, site crew or whatever else - but i assume that if you were, you wouldn't have started this thread.
i've no doubt that plenty of people meet potential dates/lovers/partners or whatever at festivals, but you need to also be aware of the fact that lots of people aren't there to pick up, and it's important to respect that lest you end up giving the creepy desperado vibe which will not only put people off, it might ruin your (and their) time at the event.
i tend to think that if you are going to meet someone at a festival, it is most likely to happen if you have some natural chemistry with someone - like if you end up hanging out together and having a good time.
probably not a scene you're going to have much success trying to be slick in an effort to "pick up" - but again, i don't know anything about you or your situation beyond what you've told us.
seriously though, i can't emphasise enough how much of a social lubricant fun is. if you're having fun, people will be drawn to you - especially in an environment where people are high and open. don't overthink it, or expect things to go as you've planned.
just play it by ear and try to enjoy yourself. if your purpose for going is to meet a girl, you'll probably be disappointed - there are singles bars and dating apps for that.