This sounds like a LOT of fun to me (and it's not a particuarly known-about thing). The musical acts are especially strong....see link below for more info.
"At Michael Arnone's 14th Annual Crawfish Fest at the Sussex County Fairgrounds, enjoy some of the best live music that New Orleans and Louisiana has to offer brought to you in NJ. We will have 10,000 pounds of live crawfish trucked up to be cooked before your eyes. Our music is as spicy as Daddy's Jambalaya. Dance to some great Zydeco, Cajun, Delta Blues, Funk and maybe a little Gospel thrown in. "