great advice from all above. I've catered several large events but never a festival. Very wise choice on pulled pork. super easy to hold and keep warm and very flexible on the presentation (nachos to sammies).
I think the smartest thing said on the whole thread was by OP. "i would rather sell out than bring food home". It's a festival. It's all about making bank and not about customer service. I say go heavy on sammies on small buns and plan to run out of the fringe items early.