I d say there are simple steps to take that will make your trip affordable.
2) Find a few people driving down from NY and catch a ride. More people in the car = less gas money and a better experience (hopefully). There is a forum set up on here that has people from all over the US and Canada who are looking for people to travel with.
3)Bring your own food. This might cut down on a bit of the cost?
Other than that, you will most likely have to spend some $$$ to attend a festival like this one. You have 3 months...save, save, save!