Weaving through the throngs of St. Patrick’s Day revelers at the Hoboken, N.J., parade earlier this month was the usual turnout that you’d expect for an event like this — local girls wearing green-beaded necklaces and green-tinted sunglasses, frat boys in green-felt top hats and tape-on leprechaun beards, and sturdy men stomping the asphalt in kilts. There was a lot of singing, of course, and a lot of beer. It was, in other words, a standard holiday turnout.