There actually is a hops shortage, I don't think it's supposed to increase prices much though. Certainly not at a place like a festival where they are overcharging anyway. Maybe a six pack will go up 50 cents.
I've heard that the main problem is that some small brewers are having trouble getting them at all. Or that they can't produce certain recipes with high hops content.
BTW...I didn't drink last year...what kind of beer do they have? Is it just Heineken? Can you get anything decent? I usually don't drink anything I can see through.