If you like that kind of thing, I highly recommend this event: http://www.state.nj.us/dep/parksandforests/historic/centennial/fairindex.htm
Obviously not as convenient as something local, but worth the drive if it's a nice day.
Promote your business here - Businesses get highlighted throughout the site and you can add a deal.
Happening this year?
I was glad to see it brought back last year. It was really cool having those muskets firing all afternoon, and the encampment actors were really friendly, informative and fun to talk with.