I'm gonna play devils advocate, I too love festivals and raving and EDM culture, so I see where your GF is coming from.

This might not be her case, so keep that in mind, but I do wanna point this out-

For a LOT of people, going to raves and festivals are an escape from the world. Specifically EDM ones, where PLUR culture is huge, a lot of people feel completely accepted at these events. I know countless people who describe raves and festivals as "home". It sounds a bit strange, I totally get it. I didn't understand that before going to my first festival at all. But then I went, and I understood. Raves/festivals are usually places where everyone is open and accepting of others, where people are kind to everyone they meet, and where everyone feels welcome to really be themselves and get lost in the music and the friendship. I have never been to any event or social setting that is as loving and welcoming as the vibes that come from a rave. Edm and the culture of festivals and raving have become a huge part of my life because they are the places where I feel completely happy- nobody is judging me, everyone is smiling and willing to go out of their way to show kindness and meet friends, and they are generally just an amazing place to be.

Her reaction was inappropriate and rude, but I'm thinking she has a deeper reason to wanting to go to raves and festivals than just to "party". You should try to figure out and understand what that reason is.

If you wanna take it this far- watch "Under the Electric Sky" on Netflix. It's a documentary that does a great job of explaining raves and festivals and the love and respect I am describing.

If traveling more is a big deal to you, and your girlfriend is unwilling to save her money for that rather than go to festivals, then maybe it's time to think about finding someone that is more interested in the same activities as you. OR, you could try attending the next rave or festival with her, and maybe it will open your eyes to why she enjoys it so much and isn't ready to cut back on attending events.