I made waterfall braids for my hair on Pukkelpop.
You can't see it very clearly on this picture, but it was a success. I'm still editing a festival video, so that you can see it more clearly soon!
I believe festival hair is all about braids, tinsels, or crazy colored wig (I once had a purple one, I don't know if I can still find picture, yes found). But since I can't find anywhere to do the colorful tinsels, also not many stores i can find some nice affordable wigs that don't look extremely fake (I miss taobao now, haha), therefore I was searching on youtube trying to figure something out, so I chose to make this waterfall braids myself.
The video tutorial I followed is: