If you live in New Jersey, like Polka and Polish food, and Polish tradition and culture, then you should make it a point to visit here every year:
@2022, Polish American Festival & Country Fair | The celebration of Polish American unity and pride!polishamericanfestival.org
It is right across the river, in Doylestown, PA, at the National Polish-American RC Shrine (The National Shrine of Our Lady of Czestochowa – Nonprofit Organization · Religious Organization · Catholic Church - https://czestochowa.us). They have live Polka bands, and tour busses come in from all over the Mid-Atlantic region for it.
The National Shrine is open year-round.
There's a Polish festival at a Polish church on River Road near Rutgers in New Brunswick, NJ every May. My wife and I haven't been, but our daughter. her husband, or her friend try to go most years and bring me back a goodie bag. My wife's from KY, so she's not really a fan of the food and I hate crowds, so we've never been.