Yeah, that's what I was thinking of. The stuff I mentioned is marketed as incense but it has similar effects of marijuana when smoked.
Tbh, it doesn't surprise me at all. Alcohol isn't very good for you and yet it's legal, so it would make sense they would be allowed at festivals and not other substances.
However, I am surprised by the amount of people that choose to get wasted at these things. I'm sure it's a good time, but I think I'd rather remember my time there heh.