It was not publicized or heavily promoted, but traditions are hard to break. That was the case on New Year’s Day 2022 when a hearty group of some 200 “plungers” arrived at Mattapoisett Town Beach for their annual dip in the harbor. Last year the event was not publicized at all, said this year’s organizers, Heather and Michael Bichsel. “But we decided since people were going to show up anyway, we’d help to keep this going.”